Rename solution directory to Elwig

Elwig/Windows/ContractListWindow.xaml

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+<Window x:Class="Elwig.Windows.ContractListWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Elwig.Windows"
+        mc:Ignorable="d"
+        Title="Flächenbindungen" Height="450" Width="800">
+    <Grid>
+        <DataGrid x:Name="ContractList" AutoGenerateColumns="False" HeadersVisibility="Column" IsReadOnly="True" GridLinesVisibility="None" SelectionMode="Single"
+                      CanUserDeleteRows="False" CanUserResizeRows="False" CanUserAddRows="False" SelectionChanged="ContractList_SelectionChanged">
+            <DataGrid.Columns>
+                <DataGridTextColumn Header="Vnr."    Binding="{Binding Vnr}"       Width="50"/>
+                <DataGridTextColumn Header="MgNr." Binding="{Binding MgNr}" Width="50"/>
+                <DataGridTextColumn Header="From"  Binding="{Binding YearFrom}"  Width="50"/>
+                <DataGridTextColumn Header="To"  Binding="{Binding YearTo}"  Width="*"/>
+            </DataGrid.Columns>
+        </DataGrid>
+
+    </Grid>
+</Window>

Elwig/Windows/ContractListWindow.xaml.cs

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+using Microsoft.EntityFrameworkCore;
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using Elwig.Helpers;
+using Elwig.Models;
+
+namespace Elwig.Windows {
+    public partial class ContractListWindow : Window {
+        private readonly AppDbContext Context = new();
+
+        public ContractListWindow(Member member) {
+            InitializeComponent();
+        }
+
+        private void RefreshContractList() {
+            Context.Members.Load();
+            List<Contract> contracts = Context.Contracts.OrderBy(c => c.MgNr).ToList();
+
+            ContractList.ItemsSource = contracts;
+            if (contracts.Count == 1)
+                ContractList.SelectedIndex = 0;
+        }
+
+        private void ContractList_SelectionChanged(object sender, SelectionChangedEventArgs evt) {
+            RefreshContractList();
+        }
+    }
+}

Elwig/Windows/DeliveryReceptionWindow.xaml

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+<Window x:Class="Elwig.Windows.DeliveryReceptionWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Elwig.Windows"
+        mc:Ignorable="d"
+        Title="Übernahme" Height="450" Width="800">
+    <Grid>
+        
+    </Grid>
+</Window>

Elwig/Windows/DeliveryReceptionWindow.xaml.cs

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+using System.Windows;
+
+namespace Elwig.Windows {
+    public partial class DeliveryReceptionWindow : Window {
+        public DeliveryReceptionWindow() {
+            InitializeComponent();
+        }
+    }
+}

Elwig/Windows/DocumentViewerWindow.xaml

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+<Window x:Class="Elwig.Windows.DocumentViewerWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
+        xmlns:local="clr-namespace:Elwig.Windows"
+        mc:Ignorable="d"
+        Closed="OnClosed"
+        Title="PDF Ansicht"
+        MinHeight="600" MinWidth="420" Height="750" Width="525">
+    <Grid>
+        <wv2:WebView2 Name="WebView"/>
+    </Grid>
+</Window>

Elwig/Windows/DocumentViewerWindow.xaml.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Windows;
+using Elwig.Helpers;
+
+namespace Elwig.Windows {
+    public partial class DocumentViewerWindow : Window {
+
+        private TempFile? PdfFile = null;
+
+        public DocumentViewerWindow(string title, string path) {
+            InitializeComponent();
+            Title = Title + " - " + title;
+            WebView.Source = new($"file://{path}#view=FitH");
+        }
+
+        public DocumentViewerWindow(string title, TempFile file) : this(title, file.FilePath) {
+            PdfFile = file;
+        }
+
+        public void OnClosed(object sender, EventArgs evt) {
+            PdfFile?.Dispose();
+            PdfFile = null;
+        }
+    }
+}

Elwig/Windows/MainWindow.xaml

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+<Window x:Class="Elwig.Windows.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Elwig.Windows"
+        mc:Ignorable="d"
+        Title="Elwig" Height="450" Width="800" ResizeMode="CanResize" SizeToContent="Manual"
+        Loaded="Window_Loaded">
+    <Grid>
+        <Button x:Name="Button2" Content="Mitglieder" Margin="472,182,178,0" VerticalAlignment="Top" Click="Button2_Click"/>
+        <Button x:Name="Button4" Content="Generate" Margin="425,300,225,0" VerticalAlignment="Top" Click="Button4_Click" Tag="Print"/>
+    </Grid>
+</Window>

Elwig/Windows/MainWindow.xaml.cs

@@ -0,0 +1,44 @@
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.Intrinsics.X86;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using Elwig.Documents;
+using Elwig.Helpers;
+
+namespace Elwig.Windows {
+    public partial class MainWindow : Window {
+        private readonly AppDbContext Context = new();
+
+        public MainWindow() {
+            InitializeComponent();
+        }
+
+        private void Window_Loaded(object sender, RoutedEventArgs evt) {
+            Context.Countries.Load();
+            Button4.IsEnabled = App.IsPrintingReady;
+        }
+
+        protected override void OnClosing(CancelEventArgs evt) {
+            Context.Dispose();
+            base.OnClosing(evt);
+        }
+
+        private void Button2_Click(object sender, RoutedEventArgs evt) {
+            var w = new MemberListWindow();
+            w.Show();
+        }
+
+        private void Button4_Click(object sender, RoutedEventArgs evt) {
+            Utils.RunBackground("PDF Generation", async () => {
+                using var letter = new BusinessLetter("Test Dokument", Context.Members.First());
+                await letter.Generate();
+                letter.Show();
+            });
+        }
+    }
+}

Elwig/Windows/MemberListWindow.xaml

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+<Window x:Class="Elwig.Windows.MemberListWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Elwig.Windows"
+        Title="Mitglieder verwalten - Elwig" Height="600" Width="1200" MinHeight="600" MinWidth="1000"
+        Loaded="Window_Loaded">
+    <Window.Resources>
+        <Style TargetType="Label">
+            <Setter Property="HorizontalAlignment" Value="Left"/>
+            <Setter Property="VerticalAlignment" Value="Top"/>
+            <Setter Property="Padding" Value="2,4,2,4"/>
+            <Setter Property="Height" Value="25"/>
+        </Style>
+        <Style TargetType="TextBox">
+            <Setter Property="HorizontalAlignment" Value="Stretch"/>
+            <Setter Property="VerticalAlignment" Value="Top"/>
+            <Setter Property="FontSize" Value="14"/>
+            <Setter Property="Padding" Value="2"/>
+            <Setter Property="IsReadOnly" Value="True"/>
+            <Setter Property="Height" Value="25"/>
+            <Setter Property="TextWrapping" Value="NoWrap"/>
+        </Style>
+        <Style TargetType="ComboBox">
+            <Setter Property="IsEnabled" Value="False"/>
+            <Setter Property="Height" Value="25"/>
+            <Setter Property="FontSize" Value="14"/>
+            <Setter Property="HorizontalAlignment" Value="Stretch"/>
+            <Setter Property="VerticalAlignment" Value="Top"/>
+        </Style>
+        <Style TargetType="Button">
+            <Setter Property="FontSize" Value="14"/>
+            <Setter Property="Padding" Value="9,3"/>
+            <Setter Property="Height" Value="27"/>
+        </Style>
+    </Window.Resources>
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="19"/>
+            <RowDefinition Height="0.8*"/>
+            <RowDefinition Height="1*"/>
+            <RowDefinition Height="1.3*"/>
+            <RowDefinition Height="0.9*"/>
+        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="370"/>
+            <ColumnDefinition Width="1*"/>
+            <ColumnDefinition Width="1*"/>
+        </Grid.ColumnDefinitions>
+
+        <Menu Grid.ColumnSpan="3" BorderThickness="0,0,0,1" BorderBrush="LightGray" Background="White">
+            <MenuItem Header="Mitglied">
+                <MenuItem x:Name="Menu_Member_SendEmail" Header="E-Mail senden" IsEnabled="False"
+                          Click="Menu_Member_SendEmail_Click"/>
+            </MenuItem>
+            <MenuItem Header="Drucken">
+                <MenuItem Header="Stammdatenblatt drucken"/>
+                <MenuItem Header="Mitgliederliste drucken"/>
+            </MenuItem>
+            <MenuItem Header="Rundschreiben">
+                <MenuItem Header="Runschreiben ausschicken"/>
+                <MenuItem Header="Alle Stammdatenblätter ausschicken"/>
+            </MenuItem>
+            <MenuItem Header="Werkzeuge">
+                <MenuItem Header="Alle Mitglieder überprüfen"/>
+            </MenuItem>
+        </Menu>
+
+        <Grid Grid.RowSpan="4" Grid.Row="1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="125"/>
+                <ColumnDefinition Width="120"/>
+                <ColumnDefinition Width="125"/>
+            </Grid.ColumnDefinitions>
+
+            <TextBox x:Name="SearchInput" Grid.ColumnSpan="3" Margin="10,7,145,0" IsReadOnly="False"
+                     TextChanged="SearchInput_TextChanged"/>
+            <CheckBox x:Name="ActiveMemberInput" Content="Nur aktive anzeigen"
+                      Checked="ActiveMemberInput_Changed" Unchecked="ActiveMemberInput_Changed"
+                      HorizontalAlignment="Right" Margin="0,12,10,0" VerticalAlignment="Top" Grid.Column="1" Grid.ColumnSpan="2"/>
+            <DataGrid x:Name="MemberList" AutoGenerateColumns="False" HeadersVisibility="Column" IsReadOnly="True" GridLinesVisibility="None" SelectionMode="Single"
+                      CanUserDeleteRows="False" CanUserResizeRows="False" CanUserAddRows="False"
+                      SelectionChanged="MemberList_SelectionChanged"
+                      Margin="10,39,10,47" FontSize="14" Grid.ColumnSpan="3">
+                <DataGrid.Columns>
+                    <DataGridTextColumn Header="MgNr."    Binding="{Binding MgNr}"       Width="70"/>
+                    <DataGridTextColumn Header="Nachname" Binding="{Binding FamilyName}" Width="4*"/>
+                    <DataGridTextColumn Header="Vorname"  Binding="{Binding GivenName}"  Width="3*"/>
+                </DataGrid.Columns>
+            </DataGrid>
+
+            <Button x:Name="NewMemberButton" Content="Neu" Click="NewMemberButton_Click"
+                    HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="10,10,0,10" Width="110" Grid.Column="0"/>
+            <Button x:Name="EditMemberButton" Content="Bearbeiten" Click="EditMemberButton_Click" IsEnabled="False"
+                    HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0,10,0,10" Width="110" Grid.Column="1"/>
+            <Button x:Name="DeleteMemberButton" Content="Löschen" Click="DeleteMemberButton_Click" IsEnabled="False"
+                    HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,10,10,10" Width="110" Grid.Column="2"/>
+
+            <Button x:Name="SaveButton" Content="Speichern" Click="SaveButton_Click" IsEnabled="False" Visibility="Hidden"
+                    HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="10,10,0,10" Width="110" Grid.Column="0"/>
+            <Button x:Name="ResetButton" Content="Zurücksetzen" Click="ResetButton_Click" IsEnabled="False" Visibility="Hidden"
+                    HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0,10,0,10" Width="110" Grid.Column="1"/>
+            <Button x:Name="CancelButton" Content="Abbrechen" Click="CancelButton_Click" IsEnabled="False" Visibility="Hidden" IsCancel="True"
+                    HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,10,10,10" Width="110" Grid.Column="2"/>
+        </Grid>
+
+        <GroupBox Header="Persönliche Daten" Grid.Column="1" Grid.Row="1" Grid.RowSpan="2" Margin="5,5,5,5">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="80"/>
+                    <ColumnDefinition Width="3*"/>
+                    <ColumnDefinition Width="50"/>
+                    <ColumnDefinition Width="2*"/>
+                </Grid.ColumnDefinitions>
+
+                <Label Content="MgNr.:" Margin="10,10,0,0" Grid.Column="0"/>
+                <TextBox x:Name="MgNrInput" Margin="0,10,0,0" Width="48" Grid.Column="1" TextAlignment="Right" HorizontalAlignment="Left"
+                         TextChanged="MgNrInput_TextChanged" LostFocus="MgNrInput_LostFocus"/>
+
+                <Label Content="Vorg.:" Margin="10,10,0,0" Grid.Column="2"/>
+                <TextBox x:Name="PredecessorMgNrInput" Margin="0,10,10,0" Width="48" Grid.Column="3" TextAlignment="Right" HorizontalAlignment="Left"
+                         TextChanged="PredecessorMgNrInput_TextChanged" LostFocus="PredecessorMgNrInput_LostFocus"/>
+
+                <Label Content="Vorname:" Margin="10,40,0,0" Grid.Column="0"/>
+                <TextBox x:Name="GivenNameInput" Margin="0,40,0,0" Grid.Column="1"
+                         TextChanged="TextBox_TextChanged"/>
+
+                <Label Content="Präfix:" Margin="10,40,0,0" Grid.Column="2"/>
+                <TextBox x:Name="PrefixInput" Margin="0,40,10,0" Grid.Column="3"
+                         TextChanged="TextBox_TextChanged"/>
+
+                <Label Content="Nachname:" Margin="10,70,0,0" Grid.Column="0"/>
+                <TextBox x:Name="FamilyNameInput" Margin="0,70,0,0" Grid.Column="1"
+                         TextChanged="TextBox_TextChanged"/>
+
+                <Label Content="Suffix:" Margin="10,70,0,0" Grid.Column="2"/>
+                <TextBox x:Name="SuffixInput" Margin="0,70,10,0" Grid.Column="3"
+                         TextChanged="TextBox_TextChanged"/>
+
+                <Label Content="Geburtstag:" Margin="10,100,0,0" Grid.Column="0"/>
+                <TextBox x:Name="BirthdayInput" Margin="0,100,0,0" Grid.Column="1" Width="78" TextAlignment="Right" HorizontalAlignment="Left"
+                         TextChanged="BirthdayInput_TextChanged"/>
+
+                <Label Content="Adresse:" Margin="10,130,0,0"/>
+                <TextBox x:Name="AddressInput" Margin="0,130,10,0" Grid.Column="1" Grid.ColumnSpan="3"
+                         TextChanged="TextBox_TextChanged"/>
+
+                <Label Content="PLZ/Ort:" Margin="10,160,0,0" Grid.Column="0"/>
+                <TextBox x:Name="PlzInput" Margin="0,160,0,0" Width="42" Grid.Column="1" HorizontalAlignment="Left"
+                         TextChanged="PlzInput_TextChanged" LostFocus="PlzInput_LostFocus"/>
+                <ComboBox x:Name="OrtInput" ItemTemplate="{StaticResource PostalDestComboBoxTemplate}" TextSearch.TextPath="Ort.Name"
+                          SelectionChanged="ComboBox_SelectionChanged"
+                          Margin="47,160,10,0" Grid.Column="1" Grid.ColumnSpan="3"/>
+            </Grid>
+        </GroupBox>
+        <GroupBox Header="Kontaktdaten" Grid.Column="1" Grid.Row="3" Margin="5,5,5,5">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="115"/>
+                    <ColumnDefinition/>
+                </Grid.ColumnDefinitions>
+
+                <Label Content="E-Mail-Adresse:" Margin="10,10,0,0" Grid.Column="0"/>
+                <TextBox x:Name="EmailInput" Margin="0,10,10,0" Grid.Column="1"
+                         TextChanged="EmailInput_TextChanged" LostFocus="EmailInput_LostFocus"/>
+
+                <Label Content="Tel.-Nr. (Festnetz):" Margin="10,40,0,0" Grid.Column="0"/>
+                <TextBox x:Name="PhoneLandlineInput" Margin="0,40,10,0" Grid.Column="1"
+                         TextChanged="PhoneNrInput_TextChanged" LostFocus="PhoneNrInput_LostFocus"/>
+
+                <Label Content="Tel.-Nr. (mobil):" Margin="10,70,0,0" Grid.Column="0"/>
+                <TextBox x:Name="PhoneMobile1Input" Margin="0,70,10,0" Grid.Column="1"
+                         TextChanged="PhoneNrInput_TextChanged" LostFocus="PhoneNrInput_LostFocus"/>
+
+                <Label Content="Tel.-Nr. (mobil):" Margin="10,100,0,0" Grid.Column="0"/>
+                <TextBox x:Name="PhoneMobile2Input" Margin="0,100,10,0" Grid.Column="1"
+                         TextChanged="PhoneNrInput_TextChanged" LostFocus="PhoneNrInput_LostFocus"/>
+            </Grid>
+        </GroupBox>
+        <GroupBox Header="Bankverbindung" Grid.Column="1" Grid.Row="4" Margin="5,5,5,10">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="65"/>
+                    <ColumnDefinition/>
+                </Grid.ColumnDefinitions>
+
+                <Label Content="IBAN:" Margin="10,10,0,0" Grid.Column="0"/>
+                <TextBox x:Name="IbanInput" Margin="0,10,10,0" Grid.Column="1"
+                         TextChanged="IbanInput_TextChanged" LostFocus="IbanInput_LostFocus"/>
+
+                <Label Content="BIC:" Margin="10,40,0,0" Grid.Column="0"/>
+                <TextBox x:Name="BicInput" Margin="0,40,10,0" Grid.Column="1"
+                         TextChanged="BicInput_TextChanged" LostFocus="BicInput_LostFocus"/>
+            </Grid>
+        </GroupBox>
+        <GroupBox Header="Betrieb" Grid.Column="2" Grid.Row="1" Grid.RowSpan="1" Margin="5,5,5,5">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="90"/>
+                    <ColumnDefinition Width="150"/>
+                    <ColumnDefinition/>
+                </Grid.ColumnDefinitions>
+
+                <Label Content="UID:" Margin="10,10,0,0" Grid.Column="0"/>
+                <TextBox x:Name="UstIdInput" Margin="0,10,10,0" Grid.Column="1" Width="120" HorizontalAlignment="Left"
+                         TextChanged="UstIdInput_TextChanged" LostFocus="UstIdInput_LostFocus"/>
+
+                <Label Content="BetriebsNr.:" Margin="10,40,0,0" Grid.Column="0"/>
+                <TextBox x:Name="LfbisNrInput" Margin="0,40,10,0" Grid.Column="1" Width="64" HorizontalAlignment="Left" TextAlignment="Right"
+                         TextChanged="LfbisNrInput_TextChanged" LostFocus="LfbisNrInput_LostFocus"/>
+
+                <CheckBox x:Name="BuchführendInput" Content="Buchführend" IsEnabled="False"
+                          Checked="CheckBox_Changed" Unchecked="CheckBox_Changed"
+                          Grid.Column="2" HorizontalAlignment="Left" Margin="10,15,0,0" VerticalAlignment="Top" IsChecked="False"/>
+            </Grid>
+        </GroupBox>
+        <GroupBox Header="Rechnungsadresse (optional)" Grid.Column="2" Grid.Row="2" Grid.RowSpan="1" Margin="5,5,5,5">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="65"/>
+                    <ColumnDefinition/>
+                </Grid.ColumnDefinitions>
+
+                <Label Content="Name:" Margin="10,10,0,0" Grid.Column="0"/>
+                <TextBox x:Name="BillingName" Margin="0,10,10,10" Grid.Column="1" Grid.ColumnSpan="2"
+                         TextChanged="TextBox_TextChanged"/>
+
+                <Label Content="Adresse:" Margin="10,40,0,0" Grid.Column="0"/>
+                <TextBox x:Name="BillingAddressInput" Margin="0,40,10,0" Grid.Column="1"
+                         TextChanged="TextBox_TextChanged"/>
+
+                <Label Content="PLZ/Ort:" Margin="10,70,0,0" Grid.Column="0"/>
+                <TextBox x:Name="BillingPlzInput" Margin="0,70,0,0" Width="42" Grid.Column="1" HorizontalAlignment="Left"
+                         TextChanged="BillingPlzInput_TextChanged" LostFocus="BillingPlzInput_LostFocus"/>
+                <ComboBox x:Name="BillingOrtInput" ItemTemplate="{StaticResource PostalDestComboBoxTemplate}" TextSearch.TextPath="Ort.Name"
+                          SelectionChanged="ComboBox_SelectionChanged"
+                          Margin="47,70,10,0" Grid.Column="1"/>
+            </Grid>
+        </GroupBox>
+        <GroupBox Header="Genossenschaft" Grid.Column="2" Grid.Row="3" Grid.RowSpan="2" Margin="5,5,5,10">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="120"/>
+                    <ColumnDefinition Width="120"/>
+                    <ColumnDefinition/>
+                </Grid.ColumnDefinitions>
+
+                <Label Content="Eintritt:" Margin="10,10,0,0" Grid.Column="0"/>
+                <TextBox x:Name="EntryDateInput" Margin="0,10,10,0" Width="78" Grid.Column="1" HorizontalAlignment="Left"  TextAlignment="Right"
+                         TextChanged="DateInput_TextChanged"/>
+
+                <Label Content="Austritt:" Margin="10,40,0,0" Grid.Column="0"/>
+                <TextBox x:Name="ExitDateInput"  Margin="0,40,10,0" Width="78" Grid.Column="1" HorizontalAlignment="Left" TextAlignment="Right"
+                         TextChanged="DateInput_TextChanged"/>
+
+                <Label Content="Geschäftsanteile:" Margin="10,70,0,0" Grid.Column="0"/>
+                <TextBox x:Name="BusinessSharesInput" Margin="0,70,10,0" Width="48" Grid.Column="1" HorizontalAlignment="Left"  TextAlignment="Right"
+                         TextChanged="NumericInput_TextChanged"/>
+
+                <Label Content="BH-Konto:" Margin="10,100,0,0" Grid.Column="0"/>
+                <TextBox x:Name="AccountingNrInput" Margin="0,100,10,0" Grid.Column="1"
+                         TextChanged="TextBox_TextChanged"/>
+
+                <CheckBox x:Name="ActiveInput" Content="Aktiv" IsEnabled="False"
+                          Checked="CheckBox_Changed" Unchecked="CheckBox_Changed"
+                          Grid.Column="2" HorizontalAlignment="Left" Margin="10,15,0,0" VerticalAlignment="Top" IsChecked="False"/>
+
+                <CheckBox x:Name="VollLieferantInput" Content="Volllieferant" IsEnabled="False"
+                          Checked="CheckBox_Changed" Unchecked="CheckBox_Changed"
+                          Grid.Column="2" HorizontalAlignment="Left" Margin="10,45,0,0" VerticalAlignment="Top" IsChecked="False"/>
+
+                <CheckBox x:Name="FunkionärInput" Content="Funktionär" IsEnabled="False"
+                          Checked="CheckBox_Changed" Unchecked="CheckBox_Changed"
+                          Grid.Column="2" HorizontalAlignment="Left" Margin="10,75,0,0" VerticalAlignment="Top" IsChecked="False"/>
+
+                <Label Content="StammZwst.:" Margin="10,130,0,0" Grid.Column="0"/>
+                <ComboBox x:Name="BranchInput" ItemTemplate="{StaticResource BranchTemplate}" TextSearch.TextPath="Name"
+                          SelectionChanged="ComboBox_SelectionChanged"
+                          Margin="0,130,10,0" Grid.Column="1" Grid.ColumnSpan="2"/>
+
+                <Label Content="Stammgemeinde:" Margin="10,160,0,0" Grid.Column="0"/>
+                <ComboBox x:Name="DefaultKgInput" ItemTemplate="{StaticResource KgTemplate}" TextSearch.TextPath="Name"
+                          SelectionChanged="ComboBox_SelectionChanged"
+                          Margin="0,160,10,0" Grid.Column="1" Grid.ColumnSpan="2"/>
+
+                <Label Content="Anmerkung:" Margin="10,190,0,0" Grid.Column="0"/>
+                <TextBox x:Name="CommentInput" Margin="0,190,10,0" Grid.Column="1" Grid.ColumnSpan="2"
+                         TextChanged="TextBox_TextChanged"/>
+
+                <Label Content="Kontaktart:" Margin="10,220,0,0" Grid.Column="0"/>
+                <RadioButton x:Name="ContactPostInput" GroupName="DefaultContact" Content="Post" IsEnabled="False"
+                             Checked="RadioButton_Changed" Unchecked="RadioButton_Changed"
+                             HorizontalAlignment="Left" Margin="0,225,0,0" VerticalAlignment="Top" Grid.Column="1" Grid.ColumnSpan="2"/>
+                <RadioButton x:Name="ContactEmailInput" GroupName="DefaultContact" Content="E-Mail" IsEnabled="False"
+                             Checked="RadioButton_Changed" Unchecked="RadioButton_Changed"
+                             HorizontalAlignment="Left" Margin="60,225,0,0" VerticalAlignment="Top" Grid.Column="1" Grid.ColumnSpan="2"/>
+
+                <Label Content="Gebundene Fläche:" Margin="10,250,0,0" Grid.Column="0"/>
+                <TextBlock x:Name="AreaCommitment" Text="- m²"
+                           Grid.Column="1" HorizontalAlignment="Stretch" Margin="5,252,5,0" TextWrapping="NoWrap" VerticalAlignment="Top" FontSize="14" TextAlignment="Right"/>
+
+                <Button x:Name="ContractButton" Content="Flächenbindungen" Click="ContractButton_Click"
+                        HorizontalAlignment="Right" Margin="10,10,10,10" VerticalAlignment="Bottom" Grid.ColumnSpan="3"/>
+            </Grid>
+        </GroupBox>
+    </Grid>
+</Window>

Elwig/Windows/MemberListWindow.xaml.cs

@@ -0,0 +1,674 @@
+using Microsoft.EntityFrameworkCore;
+using ModernWpf.Controls;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using Elwig.Helpers;
+using Elwig.Models;
+
+
+namespace Elwig.Windows {
+    public partial class MemberListWindow : Window {
+        private bool IsEditing = false;
+        private bool IsCreating = false;
+        private List<string> TextFilter = new();
+        private readonly Control[] ExemptInputs;
+        private IEnumerable<TextBox> TextBoxInputs = Array.Empty<TextBox>();
+        private IEnumerable<ComboBox> ComboBoxInputs = Array.Empty<ComboBox>();
+        private IEnumerable<CheckBox> CheckBoxInputs = Array.Empty<CheckBox>();
+        private IEnumerable<RadioButton> RadioButtonInputs = Array.Empty<RadioButton>();
+        private readonly Dictionary<Control, bool> Valid = new();
+        private readonly Dictionary<Control, object?> OriginalValues = new();
+        private readonly RoutedCommand CtrlF = new();
+        private readonly AppDbContext Context = new();
+
+        public MemberListWindow() {
+            InitializeComponent();
+            CtrlF.InputGestures.Add(new KeyGesture(Key.F, ModifierKeys.Control));
+            CommandBindings.Add(new CommandBinding(CtrlF, FocusSearchInput));
+            ExemptInputs = new Control[] {
+                SearchInput, ActiveMemberInput, MemberList,
+                NewMemberButton, EditMemberButton, DeleteMemberButton,
+                ResetButton, SaveButton, CancelButton
+            };
+        }
+
+        private void Window_Loaded(object sender, RoutedEventArgs evt) {
+            ActiveMemberInput.IsChecked = true;
+            BranchInput.ItemsSource = Context.Branches.OrderBy(b => b.Name).ToList();
+            DefaultKgInput.ItemsSource = Context.WbKgs.Select(k => k.Kg).OrderBy(k => k.Name).ToList();
+            TextBoxInputs = Utils.FindVisualChilds<TextBox>(this, ExemptInputs).ToList();
+            ComboBoxInputs = Utils.FindVisualChilds<ComboBox>(this, ExemptInputs).ToList();
+            CheckBoxInputs = Utils.FindVisualChilds<CheckBox>(this, ExemptInputs).ToList();
+            RadioButtonInputs = Utils.FindVisualChilds<RadioButton>(this, ExemptInputs).ToList();
+            foreach (var tb in TextBoxInputs)
+                Valid[tb] = true;
+        }
+
+        protected override void OnClosing(CancelEventArgs evt) {
+            Context.Dispose();
+            base.OnClosing(evt);
+        }
+
+        private int CountMatchesInMember(Member m) {
+            if (TextFilter.Count == 0) return 0;
+            string?[] check = new string?[] { m.MgNr.ToString(), m.FamilyName.ToLower(), m.GivenName.ToLower(), m.DefaultKg?.Name?.ToLower() };
+            int i = 0;
+            foreach (string? c in check) {
+                if (c == null) continue;
+                if (TextFilter.Any(f => c == f))
+                    i += 10;
+                else if (TextFilter.Any(f => c.Contains(f)))
+                    i += 1;
+            }
+            return i;
+        }
+
+        private void RefreshMemberList() {
+            Context.Members.Load();
+            IQueryable<Member> memberQuery = Context.Members;
+            if (ActiveMemberInput.IsChecked == true)
+                memberQuery = memberQuery.Where(m => m.IsActive);
+
+            List<Member> members = memberQuery.ToList();
+            members = members.OrderBy(m => m.FamilyName + " " + m.GivenName).ToList();
+
+            if (TextFilter.Count > 0) {
+                members = members
+                    .ToDictionary(m => m, m => CountMatchesInMember(m))
+                    .OrderByDescending(a => a.Value)
+                    .Where(a => a.Value > 0)
+                    .Select(a => a.Key)
+                    .ToList();
+            }
+            MemberList.ItemsSource = members;
+            if (members.Count == 1)
+                MemberList.SelectedIndex = 0;
+
+            RefreshInputs();
+        }
+
+        private void ClearInputStates() {
+            foreach (var tb in TextBoxInputs)
+                Utils.ClearInputState(tb);
+            foreach (var cb in ComboBoxInputs)
+                Utils.ClearInputState(cb);
+            foreach (var cb in CheckBoxInputs)
+                Utils.ClearInputState(cb);
+            foreach (var rb in RadioButtonInputs)
+                Utils.ClearInputState(rb);
+        }
+
+        private void RefreshInputs(bool validate = false) {
+            ClearInputStates();
+            Member m = (Member)MemberList.SelectedItem;
+            if (m != null) {
+                EditMemberButton.IsEnabled = true;
+                DeleteMemberButton.IsEnabled = true;
+                FillInputs(m);
+            } else {
+                EditMemberButton.IsEnabled = false;
+                DeleteMemberButton.IsEnabled = false;
+                ClearInputs();
+            }
+            if (!validate) ClearInputStates();
+            GC.Collect();
+        }
+
+        private void InitInputs() {
+            MgNrInput.Text = Utils.NextMgNr(Context).ToString();
+            EntryDateInput.Text = DateTime.Now.ToString("dd.MM.yyyy");
+            if (Context.Branches.Count() == 1)
+                BranchInput.SelectedItem = Context.Branches.First();
+            ActiveInput.IsChecked = true;
+            ContactPostInput.IsChecked = true;
+            FillOriginalValues();
+        }
+
+        private void MemberList_SelectionChanged(object sender, RoutedEventArgs evt) {
+            RefreshInputs();
+        }
+
+        private void ActiveMemberInput_Changed(object sender, RoutedEventArgs evt) {
+            RefreshMemberList();
+        }
+
+        private void NewMemberButton_Click(object sender, RoutedEventArgs evt) {
+            IsCreating = true;
+            MemberList.IsEnabled = false;
+            MemberList.SelectedItem = null;
+            HideNewEditDeleteButtons();
+            ShowSaveResetCancelButtons();
+            UnlockInputs();
+            InitInputs();
+            LockSearchInputs();
+        }
+
+        private void EditMemberButton_Click(object sender, RoutedEventArgs evt) {
+            if (MemberList.SelectedItem == null)
+                return;
+
+            IsEditing = true;
+            MemberList.IsEnabled = false;
+
+            HideNewEditDeleteButtons();
+            ShowSaveResetCancelButtons();
+            UnlockInputs();
+            LockSearchInputs();
+        }
+
+        private void DeleteMemberButton_Click(object sender, RoutedEventArgs evt) {
+            Member m = (Member)MemberList.SelectedItem;
+            if (m == null) return;
+
+            var r = MessageBox.Show(
+                $"Soll das Mitglied \"{m.FamilyName} {m.GivenName}\" (MgNr. {m.MgNr}) wirklich unwiderruflich gelöscht werden?",
+                "Mitglied löschen", MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);
+            if (r == MessageBoxResult.Yes) {
+                Context.Remove(m);
+                Context.SaveChanges();
+                RefreshMemberList();
+            }
+        }
+
+        private void SaveButton_Click(object sender, RoutedEventArgs evt) {
+            Member? m = new();
+            if (IsEditing)
+                m = (Member)MemberList.SelectedItem;
+            else if (IsCreating)
+                m = new();
+
+            int newMgNr = int.Parse(MgNrInput.Text);
+            m.PredecessorMgNr = (PredecessorMgNrInput.Text == "") ? null : int.Parse(PredecessorMgNrInput.Text);
+            m.Prefix = (PrefixInput.Text == "") ? null : PrefixInput.Text;
+            m.GivenName = GivenNameInput.Text;
+            m.FamilyName = FamilyNameInput.Text;
+            m.Suffix = (SuffixInput.Text == "") ? null : SuffixInput.Text;
+            m.Birthday = (BirthdayInput.Text == "") ? null : string.Join("-", BirthdayInput.Text.Split(".").Reverse());
+            m.CountryCode = "AT";
+            m.PostalDestId = ((AT_PlzDest)OrtInput.SelectedItem).Id;
+            m.Address = AddressInput.Text;
+
+            m.Email = (EmailInput.Text == "") ? null : EmailInput.Text;
+            m.PhoneLandline = (PhoneLandlineInput.Text == "") ? null : PhoneLandlineInput.Text.Replace(" ", "");
+            m.PhoneMobile1 = (PhoneMobile1Input.Text == "") ? null : PhoneMobile1Input.Text.Replace(" ", "");
+            m.PhoneMobile2 = (PhoneMobile2Input.Text == "") ? null : PhoneMobile2Input.Text.Replace(" ", "");
+
+            m.Iban = (IbanInput.Text == "") ? null : IbanInput.Text.Replace(" ", "");
+            m.Bic = (BicInput.Text == "") ? null : BicInput.Text;
+
+            m.UstId = (UstIdInput.Text == "") ? null : UstIdInput.Text;
+            m.LfbisNr = (LfbisNrInput.Text == "") ? null : LfbisNrInput.Text;
+            m.IsBuchführend = BuchführendInput.IsChecked ?? false;
+
+            // TODO Rechnungsadresse
+
+            m.EntryDate = (EntryDateInput.Text == "") ? null : string.Join("-", EntryDateInput.Text.Split(".").Reverse());
+            m.ExitDate = (ExitDateInput.Text == "") ? null : string.Join("-", ExitDateInput.Text.Split(".").Reverse());
+            m.BusinessShares = (BusinessSharesInput.Text == "") ? 0 : int.Parse(BusinessSharesInput.Text);
+            m.AccountingNr = (AccountingNrInput.Text == "") ? null : AccountingNrInput.Text;
+            m.IsActive = ActiveInput.IsChecked ?? false;
+            m.IsVollLieferant = VollLieferantInput.IsChecked ?? false;
+            m.IsFunktionär = FunkionärInput.IsChecked ?? false;
+            m.ZwstId = ((Branch)BranchInput.SelectedItem).ZwstId;
+            m.DefaultKgNr = ((AT_Kg)DefaultKgInput.SelectedItem).KgNr;
+            m.Comment = (CommentInput.Text == "") ? null : CommentInput.Text;
+            m.DefaultContact = "post";
+            if (ContactPostInput.IsChecked ?? false) m.DefaultContact = "post";
+            if (ContactEmailInput.IsChecked ?? false) m.DefaultContact = "email";
+
+            try {
+                if (IsEditing)
+                    Context.Update(m);
+                else if (IsCreating)
+                    Context.Add(m);
+                Context.SaveChanges();
+
+                if (newMgNr != m.MgNr)
+                    Context.Database.ExecuteSql($"UPDATE member SET mgnr = {newMgNr} WHERE mgnr = {m.MgNr}");
+            } catch (Exception exc) {
+                var str = "Der Eintrag konnte nicht in der Datenbank aktualisiert werden!\n\n" + exc.Message;
+                if (exc.InnerException != null) str += "\n\n" + exc.InnerException.Message;
+                MessageBox.Show(str, "Mitglied aktualisieren", MessageBoxButton.OK, MessageBoxImage.Error);
+            }
+
+            IsEditing = false;
+            IsCreating = false;
+            MemberList.IsEnabled = true;
+            HideSaveResetCancelButtons();
+            ShowNewEditDeleteButtons();
+            LockInputs();
+            UnlockSearchInputs();
+            RefreshMemberList();
+        }
+
+        private void ResetButton_Click(object sender, RoutedEventArgs evt) {
+            if (IsEditing) {
+                RefreshInputs();
+            } else if (IsCreating) {
+                InitInputs();
+            }
+            UpdateButtons();
+        }
+
+        private void CancelButton_Click(object sender, RoutedEventArgs evt) {
+            IsEditing = false;
+            IsCreating = false;
+            MemberList.IsEnabled = true;
+            HideSaveResetCancelButtons();
+            ShowNewEditDeleteButtons();
+            RefreshInputs();
+            ClearInputStates();
+            LockInputs();
+            UnlockSearchInputs();
+        }
+
+        private void ContractButton_Click(object sender, RoutedEventArgs evt) {
+            var w = new ContractListWindow((Member)MemberList.SelectedItem);
+            w.Show();
+        }
+
+        private void SearchInput_TextChanged(object sender, RoutedEventArgs evt) {
+            TextFilter = SearchInput.Text.ToLower().Split(" ").ToList().FindAll(s => s != "");
+            RefreshMemberList();
+        }
+
+        private void Menu_Member_SendEmail_Click(object sender, RoutedEventArgs evt) {
+            Utils.MailTo(((Member)MemberList.SelectedItem).Email);
+        }
+
+        private void FocusSearchInput(object sender, RoutedEventArgs evt) {
+            if (!IsEditing && !IsCreating) {
+                SearchInput.Focus();
+                SearchInput.SelectAll();
+            }
+        }
+
+        private void ShowSaveResetCancelButtons() {
+            SaveButton.IsEnabled = false;
+            ResetButton.IsEnabled = false;
+            CancelButton.IsEnabled = true;
+            SaveButton.Visibility = Visibility.Visible;
+            ResetButton.Visibility = Visibility.Visible;
+            CancelButton.Visibility = Visibility.Visible;
+        }
+
+        private void HideSaveResetCancelButtons() {
+            SaveButton.IsEnabled = false;
+            ResetButton.IsEnabled = false;
+            CancelButton.IsEnabled = false;
+            SaveButton.Visibility = Visibility.Hidden;
+            ResetButton.Visibility = Visibility.Hidden;
+            CancelButton.Visibility = Visibility.Hidden;
+        }
+
+        private void ShowNewEditDeleteButtons() {
+            NewMemberButton.IsEnabled = true;
+            EditMemberButton.IsEnabled = MemberList.SelectedItem != null;
+            DeleteMemberButton.IsEnabled = MemberList.SelectedItem != null;
+            NewMemberButton.Visibility = Visibility.Visible;
+            EditMemberButton.Visibility = Visibility.Visible;
+            DeleteMemberButton.Visibility = Visibility.Visible;
+        }
+
+        private void HideNewEditDeleteButtons() {
+            NewMemberButton.IsEnabled = false;
+            EditMemberButton.IsEnabled = false;
+            DeleteMemberButton.IsEnabled = false;
+            NewMemberButton.Visibility = Visibility.Hidden;
+            EditMemberButton.Visibility = Visibility.Hidden;
+            DeleteMemberButton.Visibility = Visibility.Hidden;
+        }
+
+        private void LockInputs() {
+            foreach (var tb in TextBoxInputs)
+                tb.IsReadOnly = true;
+            foreach (var cb in ComboBoxInputs)
+                cb.IsEnabled = false;
+            foreach (var cb in CheckBoxInputs)
+                cb.IsEnabled = false;
+            foreach (var rb in RadioButtonInputs)
+                rb.IsEnabled = false;
+        }
+
+        private void UnlockInputs() {
+            foreach (var tb in TextBoxInputs)
+                tb.IsReadOnly = false;
+            foreach (var cb in ComboBoxInputs)
+                cb.IsEnabled = true;
+            foreach (var cb in CheckBoxInputs)
+                cb.IsEnabled = true;
+            foreach (var rb in RadioButtonInputs)
+                rb.IsEnabled = true;
+        }
+
+        private void LockSearchInputs() {
+            SearchInput.IsEnabled = false;
+            ActiveMemberInput.IsEnabled = false;
+        }
+
+        private void UnlockSearchInputs() {
+            SearchInput.IsEnabled = true;
+            ActiveMemberInput.IsEnabled = true;
+        }
+
+        private void FillInputs(Member m) {
+            OriginalValues.Clear();
+
+            MgNrInput.Text = m.MgNr.ToString();
+            PredecessorMgNrInput.Text = m.PredecessorMgNr.ToString();
+            PrefixInput.Text = m.Prefix;
+            GivenNameInput.Text = m.GivenName;
+            FamilyNameInput.Text = m.FamilyName;
+            SuffixInput.Text = m.Suffix;
+            BirthdayInput.Text = (m.Birthday != null) ? string.Join(".", m.Birthday.Split("-").Reverse()) : null;
+            AddressInput.Text = m.Address;
+            AT_PlzDest? p = m.PostalDest.AtPlz;
+            if (p != null) {
+                PlzInput.Text = p.Plz.ToString();
+                OrtInput.ItemsSource = p.AtPlz.Orte;
+                OrtInput.SelectedItem = p;
+            } else {
+                PlzInput.Text = null;
+                OrtInput.ItemsSource = null;
+                OrtInput.SelectedItem = null;
+            }
+
+            EmailInput.Text = m.Email;
+            PhoneLandlineInput.Text = m.PhoneLandline;
+            PhoneMobile1Input.Text = m.PhoneMobile1;
+            PhoneMobile2Input.Text = m.PhoneMobile2;
+
+            IbanInput.Text = m.Iban;
+            BicInput.Text = m.Bic;
+
+            UstIdInput.Text = m.UstId;
+            LfbisNrInput.Text = m.LfbisNr;
+            BuchführendInput.IsChecked = m.IsBuchführend;
+
+            // TODO Rechnungsadresse
+
+            EntryDateInput.Text = (m.EntryDate != null) ? string.Join(".", m.EntryDate.Split("-").Reverse()) : null;
+            ExitDateInput.Text = (m.ExitDate != null) ? string.Join(".", m.ExitDate.Split("-").Reverse()) : null;
+            BusinessSharesInput.Text = m.BusinessShares.ToString();
+            AccountingNrInput.Text = m.AccountingNr;
+            BranchInput.SelectedItem = m.Branch;
+            DefaultKgInput.SelectedItem = m.DefaultKg;
+            CommentInput.Text = m.Comment;
+            ActiveInput.IsChecked = m.IsActive;
+            VollLieferantInput.IsChecked = m.IsVollLieferant;
+            FunkionärInput.IsChecked = m.IsFunktionär;
+            switch (m.DefaultContact) {
+                case "post": ContactPostInput.IsChecked = true; break;
+                case "email": ContactEmailInput.IsChecked = true; break;
+            }
+
+            AreaCommitment.Text = $"{m.Contracts.Select(c => c.Area).Sum():N0} m²";
+
+            Menu_Member_SendEmail.IsEnabled = m.Email != null;
+
+            FillOriginalValues();
+        }
+
+        private void FillOriginalValues() {
+            foreach (var tb in TextBoxInputs)
+                OriginalValues[tb] = tb.Text;
+            foreach (var cb in ComboBoxInputs)
+                OriginalValues[cb] = cb.SelectedItem;
+            foreach (var cb in CheckBoxInputs)
+                OriginalValues[cb] = (cb.IsChecked ?? false) ? bool.TrueString : null;
+            foreach (var rb in RadioButtonInputs)
+                OriginalValues[rb] = (rb.IsChecked ?? false) ? bool.TrueString : null;
+        }
+
+        private void ClearInputs() {
+            Menu_Member_SendEmail.IsEnabled = false;
+            AreaCommitment.Text = "- m²";
+            OriginalValues.Clear();
+            foreach (var tb in TextBoxInputs) {
+                tb.Text = " ";
+                tb.Text = "";
+            }
+            foreach (var cb in ComboBoxInputs) {
+                cb.SelectedItem = null;
+                if (cb.ItemsSource != null)
+                    Utils.SetInputInvalid(cb);
+            }
+            foreach (var cb in CheckBoxInputs)
+                cb.IsChecked = false;
+            foreach (var rb in RadioButtonInputs)
+                rb.IsChecked = false;
+        }
+
+        private bool IsValid() {
+            return Valid.All(kv => kv.Value) && ComboBoxInputs.All(cb => cb.ItemsSource == null || cb.SelectedItem != null);
+        }
+
+        private void UpdateButtons() {
+            if (!IsEditing && !IsCreating) return;
+            bool ch = HasChanged(), v = IsValid();
+            ResetButton.IsEnabled = (ch);
+            SaveButton.IsEnabled = (v && ch);
+        }
+
+        private bool InputHasChanged(Control input) {
+            if (!OriginalValues.ContainsKey(input)) {
+                return false;
+            } else if (input is TextBox tb) {
+                return OriginalValues[tb]?.ToString() != tb.Text;
+            } else if (input is ComboBox sb) {
+                return OriginalValues[sb] != sb.SelectedItem;
+            } else if (input is CheckBox cb) {
+                return (OriginalValues[cb] != null) != (cb.IsChecked ?? false);
+            } else if (input is RadioButton rb) {
+                return (OriginalValues[rb] != null) != (rb.IsChecked ?? false);
+            } else {
+                return false;
+            }
+        }
+
+        private bool HasChanged() {
+            return !IsValid() ||
+                TextBoxInputs.Any(InputHasChanged) ||
+                ComboBoxInputs.Any(InputHasChanged) ||
+                CheckBoxInputs.Any(InputHasChanged) ||
+                RadioButtonInputs.Any(InputHasChanged);
+        }
+
+        private void UpdatePlz(TextBox plzInput, ComboBox ortInput, bool optional) {
+            if (plzInput.Text.Length == 4) {
+                int plz = int.Parse(plzInput.Text);
+                ortInput.ItemsSource = Context.Postleitzahlen.Where(p => p.Plz == plz).ToHashSet();
+            } else {
+                ortInput.ItemsSource = null;
+            }
+            ortInput.SelectedItem = null;
+            if (ortInput.ItemsSource != null) {
+                Utils.SetInputInvalid(ortInput);
+            } else {
+                Utils.ClearInputState(ortInput);
+            }
+            Valid[plzInput] = optional || (ortInput.ItemsSource != null);
+            UpdateButtons();
+        }
+
+        private void InputTextChanged(TextBox input, bool optional, Func<TextBox, bool, ValidationResult> checker) {
+            InputTextChanged(input, optional, (tb, opt, ctx) => checker(tb, opt));
+        }
+
+        private void InputTextChanged(TextBox input, bool optional, Func<TextBox, bool, AppDbContext, ValidationResult> checker) {
+            InputTextChanged(input, optional, (tb, opt, ctx, m) => checker(tb, opt, ctx));
+        }
+
+        private void InputTextChanged(TextBox input, bool optional, Func<TextBox, bool, AppDbContext, Member, ValidationResult> checker) {
+            var res = checker(input, optional, Context, (Member)MemberList.SelectedItem);
+            Valid[input] = res.IsValid;
+            if (res.IsValid) {
+                if (InputHasChanged(input)) {
+                    Utils.SetInputChanged(input);
+                } else {
+                    Utils.ClearInputState(input);
+                }
+            } else {
+                Utils.SetInputInvalid(input);
+            }
+            UpdateButtons();
+        }
+
+        private void InputLostFocus(TextBox input, bool optional, Func<TextBox, bool, ValidationResult> checker, string? msg = null) {
+            InputLostFocus(input, optional, (tb, optional, ctx) => checker(tb, optional), msg);
+        }
+
+        private void InputLostFocus(TextBox input, bool optional, Func<TextBox, bool, AppDbContext, ValidationResult> checker, string? msg = null) {
+            InputLostFocus(input, optional, (tb, optional, ctx, m) => checker(tb, optional, ctx), msg);
+        }
+
+        private void InputLostFocus(TextBox input, bool optional, Func<TextBox, bool, AppDbContext, Member?, ValidationResult> checker, string? msg = null) {
+            var res = checker(input, optional, Context, (Member)MemberList.SelectedItem);
+            if (!res.IsValid)
+                MessageBox.Show(res.ErrorContent.ToString(), msg ?? res.ErrorContent.ToString(), MessageBoxButton.OK, MessageBoxImage.Warning);
+        }
+
+        private void CheckBox_Changed(object sender, RoutedEventArgs evt) {
+            var input = (CheckBox)sender;
+            if (InputHasChanged(input)) {
+                Utils.SetInputChanged(input);
+            } else {
+                Utils.ClearInputState(input);
+            }
+            UpdateButtons();
+        }
+
+        private void RadioButton_Changed(object sender, RoutedEventArgs evt) {
+            var input = (RadioButton)sender;
+            if (InputHasChanged(input)) {
+                Utils.SetInputChanged(input);
+            } else {
+                Utils.ClearInputState(input);
+            }
+            UpdateButtons();
+        }
+
+        private void TextBox_TextChanged(object sender, RoutedEventArgs evt) {
+            var input = (TextBox)sender;
+            if (InputHasChanged(input)) {
+                Utils.SetInputChanged(input);
+            } else {
+                Utils.ClearInputState(input);
+            }
+            UpdateButtons();
+        }
+
+        private void ComboBox_SelectionChanged(object sender, RoutedEventArgs evt) {
+            var input = (ComboBox)sender;
+            if (input.ItemsSource != null && input.SelectedItem == null) {
+                Utils.SetInputInvalid(input);
+            } else if (InputHasChanged(input)) {
+                Utils.SetInputChanged(input);
+            } else {
+                Utils.ClearInputState(input);
+            }
+            UpdateButtons();
+        }
+
+        private void NumericInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, false, Validator.CheckNumeric);
+        }
+
+        private void MgNrInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, false, Validator.CheckMgNr);
+        }
+
+        private void MgNrInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, false, Validator.CheckMgNr);
+        }
+
+        private void PredecessorMgNrInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckPredecessorMgNr);
+        }
+
+        private void PredecessorMgNrInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, true, Validator.CheckPredecessorMgNr);
+        }
+
+        private void BirthdayInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckPartialDate);
+        }
+
+        private void PlzInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, false, Validator.CheckPlz);
+            UpdatePlz((TextBox)sender, OrtInput, false);
+        }
+
+        private void PlzInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, true, Validator.CheckPlz);
+            UpdatePlz((TextBox)sender, OrtInput, false);
+        }
+
+        private void PhoneNrInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckPhoneNumber);
+        }
+
+        private void PhoneNrInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, true, Validator.CheckPhoneNumber);
+        }
+
+        private void EmailInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckEmailAddress);
+        }
+
+        private void EmailInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, true, Validator.CheckEmailAddress);
+        }
+
+        private void IbanInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckIban);
+        }
+
+        private void IbanInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, true, Validator.CheckIban);
+        }
+
+        private void BicInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckBic);
+        }
+
+        private void BicInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, true, Validator.CheckBic);
+        }
+
+        private void UstIdInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckUstId);
+        }
+
+        private void UstIdInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, true, Validator.CheckUstId);
+        }
+
+        private void LfbisNrInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckLfbisNr);
+        }
+
+        private void LfbisNrInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, true, Validator.CheckLfbisNr);
+        }
+
+        private void BillingPlzInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckPlz);
+            UpdatePlz((TextBox)sender, BillingOrtInput, true);
+        }
+
+        private void BillingPlzInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, true, Validator.CheckPlz);
+            UpdatePlz((TextBox)sender, BillingOrtInput, true);
+        }
+
+        private void DateInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, true, Validator.CheckDate);
+        }
+    }
+}