Hello Vinod,
We have a very detailed sample application that is using the DragAndDrop manager with a GridView control. The application is uploaded online (
http://demos.telerik.com/silverlight/bugtracker) and you can also download its source code from your account download section.
Please let us know if you have any issues implementing your scenario.
Greetings,
Valentin.Stoychev
the Telerik team