The tag DataGridDragDropTarget does not exist in XML namespace clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Toolkit

The tag DataGridDragDropTarget does not exist in XML namespace clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Toolkit

I am seeing the build error, "The tag DataGridDragDropTarget does not exist in XML namespace clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Toolkit."

Looking around, I found this other StackOverflow question: http://bit.ly/m5dtf9. The answer provided here did not work for me.

I have tried restarting Visual Studio, ensuring the Bin directory is clean by manually inspecting it, removing/readding the reference. I've even looked at the System.Windows.Controls.Data.Toolkit.dll file from the Silverlight Toolkit (downloaded here) in ILSpy.

The Visual Studio XAML designer shows that the DataGridDragDropTarget exists, by providing me with intellisence when I begin typing the name.

The issue is that upon build, it's not being found.

Answers & Comments...

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