Hello Asif,
Assuming that you have installed RadControls for Silverlight in their default location, the path to the solution should be:
C:\Program Files (x86)\Telerik\RadControls for Silverlight Q2 2010\Demos
or in case you have 32bit OS:
C:\Program Files\Telerik\RadControls for Silverlight Q2 2010\Demos
Greetings,
Valeri Hristov
the Telerik team
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