I can see that you have taken the approach with the RadDragAndDropManager. We are planning on removing it from our libraries with the Q2 2014 version, which is why I strongly recommend
considering on migrating to our new mechanism - DragDropManager
. Please note that after Q2 2014, any code still running with RadDragAndDropManager will prevent you from upgrading.
I am sending you a sample project demonstrating dragging from and to external programs. It is using the new DragDropManager and our RadGridView control.
I hope this helps.
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