Updated sample version

Custom_Annotation/App.xaml.cs

@@ -1,4 +1,6 @@
-using System.Windows;
+using System.Configuration;
+using System.Data;
+using System.Windows;
 
 namespace Custom_Annotation
 {
@@ -8,4 +10,5 @@ namespace Custom_Annotation
     public partial class App : Application
     {
     }
+
 }

Custom_Annotation/AssemblyInfo.cs

@@ -1,10 +1,10 @@
 using System.Windows;
 
 [assembly: ThemeInfo(
-    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
-                                     //(used if a resource is not found in the page,
-                                     // or application resource dictionaries)
-    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
-                                              //(used if a resource is not found in the page,
-                                              // app, or any theme specific resource dictionaries)
+    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
+                                                //(used if a resource is not found in the page,
+                                                // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
+                                                //(used if a resource is not found in the page,
+                                                // app, or any theme specific resource dictionaries)
 )]

Custom_Annotation/Custom_Annotation.csproj

@@ -2,8 +2,9 @@
 
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>net6.0-windows</TargetFramework>
+    <TargetFramework>net8.0-windows</TargetFramework>
     <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
     <UseWPF>true</UseWPF>
   </PropertyGroup>
 

README.md

@@ -70,3 +70,11 @@ public class CustomTextAnnotation : RectangleAnnotation
 ## Output:
 
 ![Customized Rectangle Annotation with button](https://user-images.githubusercontent.com/102642528/212282757-e057007f-7bc2-46b7-832f-712dc69bbf20.png)
+
+## Troubleshooting
+
+#### Path too long exception
+
+If you are facing a path too long exception when building this example project, close Visual Studio and rename the repository to a shorter name before building the project.
+
+For more details, refer to the KB on [How to create a custom annotation in WPF Chart?](https://support.syncfusion.com/kb/article/12315/how-to-create-a-custom-annotation-in-wpf-chart-sfchart).