Hi Sanjay Kumar Jha ,
Thank you for your question on the Microsoft Q&A Platform.
Unfortunately, the Microsoft.Expression.Effects library is not natively supported by.NET 8. It was part of the Expression Blend SDK, which is no longer being actively maintained. To generate similar effects in your WPF application, you can use WPF's built-in effects, third-party libraries (like as SharpDX, AvalonDock).
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Thank you!