Update target framework to .NET 9.0 Core RC

AsyncTask.sln

@@ -1,6 +1,6 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
+# 17
 VisualStudioVersion = 17.9.34723.18
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "AsyncTask", "src\AsyncTask.csproj", "{6ED688CD-50C6-45B2-8AE0-759D28E468AE}"
@@ -15,18 +15,16 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		.gitignore = .gitignore
 		Properties\AsyncTask.png = Properties\AsyncTask.png
 		DataModel.md = DataModel.md
-		Directory.Build.props = Directory.Build.props
 		Flow-Chart.png = Flow-Chart.png
 		Properties\mvc.png = Properties\mvc.png
 		Output.png = Output.png
-		Properties\project.png = Properties\project.png
 		README.md = README.md
 		src\README_BODY.md = src\README_BODY.md
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Console", "Console\Console.csproj", "{336E6DA0-9F06-4A00-8603-382C594E7185}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EventElements", "EventElements\EventElements.csproj", "{ED37761C-BBD6-4E91-9EA4-7556E486E548}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "EventElements", "EventElements\EventElements.csproj", "{ED37761C-BBD6-4E91-9EA4-7556E486E548}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

Console/Console.csproj

@@ -2,15 +2,21 @@
 
 	<PropertyGroup>
 		<TargetFramework>net9.0-windows</TargetFramework>
-		<UseWindowsForms>true</UseWindowsForms>
+		<UseWPF>true</UseWPF>
 		<OutputType>WinExe</OutputType>
-		<StartupObject>Console.Program</StartupObject>
+		<StartupObject>Console.Views.App</StartupObject>
 		<GenerateREADME>False</GenerateREADME>
 		<GeneratePackageOnBuild>false</GeneratePackageOnBuild>
 		<IsPackable>false</IsPackable>
+		<Nullable>enable</Nullable>
 	</PropertyGroup>
 
 	<ItemGroup>
+		<ApplicationDefinition Include="Views\App.xaml" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Extended.Wpf.Toolkit" Version="4.6.1" />
 		<ProjectReference Include="..\src\AsyncTask.csproj" />
 	</ItemGroup>