Which version WPTFToolKit is used in ARCGISSilverlightWPF 2.1?

[PeterConn]

I have been receiving "Could not load file or assembly 'WPFToolkit, Version=3.5.40128.1, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified." errors. Does anyone know what version of the WPF toolkit was used in ARCGIS 2.1.

[dotMorten_esri]

v3.5.50211.1.
If you build for .NET 4, you don't need the WPF Toolkit.

[RichardWatson]

Here is what is on my system:

// Assembly WPFToolkit, Version 3.5.40128.1
Location: C:\Program Files (x86)\ArcGIS\Desktop10.0\Bin\WPFToolkit.dll
Name: WPFToolkit, Version=3.5.40128.1, Culture=neutral, PublicKeyToken=31bf3856ad364e35
Type: Library

[PeterConn]

Here is what is on my system:

// Assembly WPFToolkit, Version 3.5.40128.1
Location: C:\Program Files (x86)\ArcGIS\Desktop10.0\Bin\WPFToolkit.dll
Name: WPFToolkit, Version=3.5.40128.1, Culture=neutral, PublicKeyToken=31bf3856ad364e35
Type: Library

I am building using VS2008 .Net 3.5, so if I include a reverance for wpftoolkit.dll Version 3.5.40128.1 it should work?

So I found 3.5.50211.1 in the ArcGISWPFSDK source code and that one works if you add it as a referance to your WPF app. Thx.