diff --git a/Elwig/Helpers/ControlUtils.cs b/Elwig/Helpers/ControlUtils.cs
index 1327fe8..d0b075a 100644
--- a/Elwig/Helpers/ControlUtils.cs
+++ b/Elwig/Helpers/ControlUtils.cs
@@ -217,19 +217,19 @@ namespace Elwig.Helpers {
             SelectCheckComboBoxItems(ccb, getId, items?.Select(i => getId(i)));
         }
 
-        public static object? GetInputValue(Control input) {
+        public static int GetInputHashCode(Control input) {
             if (input is TextBox tb) {
-                return tb.Text;
+                return Utils.GetEntityIdentifier(tb.Text);
             } else if (input is ComboBox sb) {
-                return sb.SelectedItem;
+                return Utils.GetEntityIdentifier(sb.SelectedItem);
             } else if (input is Xceed.Wpf.Toolkit.CheckComboBox ccb) {
-                return ccb.SelectedItems.Cast<object>().ToArray();
+                return Utils.GetEntityIdentifier(ccb.SelectedItems);
             } else if (input is CheckBox cb) {
-                return cb.IsChecked?.ToString();
+                return Utils.GetEntityIdentifier(cb.IsChecked);
             } else if (input is RadioButton rb) {
-                return rb.IsChecked?.ToString();
+                return Utils.GetEntityIdentifier(rb.IsChecked);
             } else {
-                return null;
+                return 0;
             }
         }
     }
diff --git a/Elwig/Helpers/Utils.cs b/Elwig/Helpers/Utils.cs
index 1071f54..10aa6c0 100644
--- a/Elwig/Helpers/Utils.cs
+++ b/Elwig/Helpers/Utils.cs
@@ -18,7 +18,9 @@ using System.Text.Json.Nodes;
 using System.IO;
 using MailKit.Net.Smtp;
 using MailKit.Security;
-using OpenTK.Compute.OpenCL;
+using Microsoft.EntityFrameworkCore;
+using System.Reflection;
+using System.Collections;
 
 namespace Elwig.Helpers {
     public static partial class Utils {
@@ -432,5 +434,19 @@ namespace Elwig.Helpers {
             await client.AuthenticateAsync(username, password);
             return client;
         }
+
+        public static int GetEntityIdentifier(object? obj) {
+            if (obj == null) {
+                return 0;
+            } else if (obj is IEnumerable list) {
+                var arr = list.Cast<object>().Select(o => GetEntityIdentifier(o)).ToArray();
+                return ((IStructuralEquatable)arr).GetHashCode(EqualityComparer<int>.Default);
+            } else if (obj.GetType().GetCustomAttribute(typeof(PrimaryKeyAttribute), false) is not PrimaryKeyAttribute pkAttr) {
+                return obj.GetHashCode();
+            } else {
+                var pk = pkAttr.PropertyNames.Select(name => obj.GetType().GetProperty(name)!.GetValue(obj)?.GetHashCode() ?? 0).ToArray();
+                return ((IStructuralEquatable)pk).GetHashCode(EqualityComparer<int>.Default);
+            }
+        }
     }
 }
diff --git a/Elwig/Windows/AdministrationWindow.cs b/Elwig/Windows/AdministrationWindow.cs
index 730c4e5..b8525f2 100644
--- a/Elwig/Windows/AdministrationWindow.cs
+++ b/Elwig/Windows/AdministrationWindow.cs
@@ -45,8 +45,8 @@ namespace Elwig.Windows {
         private CheckBox[] CheckBoxInputs;
         private RadioButton[] RadioButtonInputs;
         private readonly Dictionary<Control, bool> Valid;
-        private readonly Dictionary<Control, object?> OriginalValues;
-        private readonly Dictionary<Control, object?> DefaultValues;
+        private readonly Dictionary<Control, int?> OriginalValues;
+        private readonly Dictionary<Control, int?> DefaultValues;
 
         public AdministrationWindow() : base() {
             IsEditing = false;
@@ -198,20 +198,20 @@ namespace Elwig.Windows {
 
         protected void FillOriginalValues() {
             foreach (var tb in TextBoxInputs)
-                OriginalValues[tb] = tb.Text;
+                OriginalValues[tb] = Utils.GetEntityIdentifier(tb.Text);
             foreach (var cb in ComboBoxInputs)
-                OriginalValues[cb] = cb.SelectedItem;
+                OriginalValues[cb] = Utils.GetEntityIdentifier(cb.SelectedItem);
             foreach (var ccb in CheckComboBoxInputs)
-                OriginalValues[ccb] = ccb.SelectedItems.Cast<object>().ToArray();
+                OriginalValues[ccb] = Utils.GetEntityIdentifier(ccb.SelectedItems);
             foreach (var cb in CheckBoxInputs)
-                OriginalValues[cb] = cb.IsChecked?.ToString();
+                OriginalValues[cb] = Utils.GetEntityIdentifier(cb.IsChecked);
             foreach (var rb in RadioButtonInputs)
-                OriginalValues[rb] = rb.IsChecked?.ToString();
+                OriginalValues[rb] = Utils.GetEntityIdentifier(rb.IsChecked);
         }
 
         protected void SetOriginalValue(Control input, object? value) {
             if (input is UnitTextBox utbx) input = utbx.TextBox;
-            OriginalValues[input] = value is bool b ? b.ToString() : value;
+            OriginalValues[input] = Utils.GetEntityIdentifier(value);
             if (InputHasChanged(input)) {
                 ControlUtils.SetInputChanged(input);
             } else {
@@ -221,7 +221,7 @@ namespace Elwig.Windows {
 
         protected void SetOriginalValue(Control input) {
             if (input is UnitTextBox utbx) input = utbx.TextBox;
-            SetOriginalValue(input, ControlUtils.GetInputValue(input));
+            SetOriginalValue(input, ControlUtils.GetInputHashCode(input));
         }
 
         protected void UnsetOriginalValue(Control input) {
@@ -232,7 +232,7 @@ namespace Elwig.Windows {
 
         protected void SetDefaultValue(Control input, object? value) {
             if (input is UnitTextBox utbx) input = utbx.TextBox;
-            DefaultValues[input] = value is bool b ? b.ToString() : value;
+            DefaultValues[input] = value != null ? Utils.GetEntityIdentifier(value) : null;
             if (!InputHasChanged(input)) {
                 if (InputIsNotDefault(input)) {
                     ControlUtils.SetInputNotDefault(input);
@@ -244,7 +244,7 @@ namespace Elwig.Windows {
 
         protected void SetDefaultValue(Control input) {
             if (input is UnitTextBox utbx) input = utbx.TextBox;
-            SetDefaultValue(input, ControlUtils.GetInputValue(input));
+            SetDefaultValue(input, ControlUtils.GetInputHashCode(input));
         }
 
         protected void UnsetDefaultValue(Control input) {
@@ -281,15 +281,15 @@ namespace Elwig.Windows {
             if (!OriginalValues.ContainsKey(input)) {
                 return false;
             } else if (input is TextBox tb) {
-                return OriginalValues[tb]?.ToString() != tb.Text;
+                return OriginalValues[tb] != Utils.GetEntityIdentifier(tb.Text);
             } else if (input is ComboBox sb) {
-                return OriginalValues[sb] != sb.SelectedItem;
+                return OriginalValues[sb] != Utils.GetEntityIdentifier(sb.SelectedItem);
             } else if (input is CheckComboBox ccb) {
-                return !ccb.SelectedItems.Cast<object>().ToArray().SequenceEqual(((object[]?)OriginalValues[ccb]) ?? []);
+                return OriginalValues[ccb] != Utils.GetEntityIdentifier(ccb.SelectedItems);
             } else if (input is CheckBox cb) {
-                return (string?)OriginalValues[cb] != cb.IsChecked?.ToString();
+                return OriginalValues[cb] != Utils.GetEntityIdentifier(cb.IsChecked);
             } else if (input is RadioButton rb) {
-                return (string?)OriginalValues[rb] != rb.IsChecked?.ToString();
+                return OriginalValues[rb] != Utils.GetEntityIdentifier(rb.IsChecked);
             } else {
                 return false;
             }
@@ -300,15 +300,15 @@ namespace Elwig.Windows {
             if (!DefaultValues.ContainsKey(input)) {
                 return false;
             } else if (input is TextBox tb) {
-                return DefaultValues[tb]?.ToString() != tb.Text;
+                return DefaultValues[tb] != Utils.GetEntityIdentifier(tb.Text);
             } else if (input is ComboBox sb) {
-                return DefaultValues[sb] != sb.SelectedItem;
+                return DefaultValues[sb] != Utils.GetEntityIdentifier(sb.SelectedItem);
             } else if (input is CheckComboBox ccb) {
-                return !ccb.SelectedItems.Cast<object>().ToArray().SequenceEqual(((object[]?)DefaultValues[ccb]) ?? []);
+                return DefaultValues[ccb] != Utils.GetEntityIdentifier(ccb.SelectedItems);
             } else if (input is CheckBox cb) {
-                return (string?)DefaultValues[cb] != cb.IsChecked?.ToString();
+                return DefaultValues[cb] != Utils.GetEntityIdentifier(cb.IsChecked);
             } else if (input is RadioButton rb) {
-                return (string?)DefaultValues[rb] != rb.IsChecked?.ToString();
+                return DefaultValues[rb] != Utils.GetEntityIdentifier(rb.IsChecked);
             } else {
                 return false;
             }