Upgraded to .NET 9

imagecatalog/Form1.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Diagnostics;
 using System.Drawing;
 using System.IO;
@@ -51,6 +52,7 @@ namespace ImageCatalog
         // Do not modify it using the code editor.
         private Button _Button1;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal Button Button1
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -82,6 +84,7 @@ namespace ImageCatalog
         internal Label Label20;
         private Button _Button6;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal Button Button6
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -108,6 +111,7 @@ namespace ImageCatalog
 
         private Button _Button5;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal Button Button5
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -134,6 +138,7 @@ namespace ImageCatalog
 
         private Button _Button7;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal Button Button7
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -173,6 +178,7 @@ namespace ImageCatalog
         internal PictureBox PictureBox2;
         private PictureBox _PictureBox1;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal PictureBox PictureBox1
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -213,6 +219,7 @@ namespace ImageCatalog
         internal Label Label23;
         private Button _Button4;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal Button Button4
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -277,6 +284,7 @@ namespace ImageCatalog
         internal GroupBox GroupBox5;
         private Button _Button8;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal Button Button8
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -332,6 +340,7 @@ namespace ImageCatalog
         internal CheckBox CheckBox6;
         private Button _Button3;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal Button Button3
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -358,6 +367,7 @@ namespace ImageCatalog
 
         private Button _Button2;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal Button Button2
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -410,6 +420,7 @@ namespace ImageCatalog
         internal Panel Panel1;
         private CheckBox _CheckBox18;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal CheckBox CheckBox18
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -436,6 +447,7 @@ namespace ImageCatalog
 
         private CheckBox _CheckBox4;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal CheckBox CheckBox4
         {
             [MethodImpl(MethodImplOptions.Synchronized)]
@@ -462,6 +474,7 @@ namespace ImageCatalog
 
         private CheckBox _CheckBox12;
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         internal CheckBox CheckBox12
         {
             [MethodImpl(MethodImplOptions.Synchronized)]

imagecatalog/ImageCatalog 2.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>net8.0-windows</TargetFramework>
+    <TargetFramework>net9.0-windows</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <UseWindowsForms>true</UseWindowsForms>

imagecatalog/MainForm.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Drawing;
 using System.Drawing.Text;
 using System.IO;
@@ -25,6 +26,7 @@ namespace ImageCatalog
     public partial class MainForm
     {
 
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         public DataModel Model { get; set; }
 
         private readonly ITestService _service;