How to roll back a Drag and Drop operation

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I drag one item from ReportControl A and drop it to ReportControl B.If the item doesn't match, a 'Yes/No' messageBox will be shown to ask whether the drag and drop operation will continue. 
If the user choose continue the operation, the drag and drop operation will be finished.
If the user choose stop the operation, the items of control A and control B should keep the old status.

Now, I put above operation in OnReportDrop() method. When the user choose 'No', I wrote 'return;'.
And I forbid the other operation in  OnReportDragDropCompleted() method. But the item still disappear in control A and appear in control B.
So,How to roll back a drag and drop operation?
Thanks very much.

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Rat Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 November 2011 Status: Offline Points: 9	Post Options Post Reply Quote Rat Report Post Thanks(0) Quote Reply Topic: How to roll back a Drag and Drop operation Posted: 24 November 2011 at 4:57am
	I drag one item from ReportControl A and drop it to ReportControl B. If the item doesn't match, a 'Yes/No' messageBox will be shown to ask whether the drag and drop operation will continue. If the user choose continue the operation, the drag and drop operation will be finished. If the user choose stop the operation, the items of control A and control B should keep the old status. Now, I put above operation in OnReportDrop() method. When the user choose 'No', I wrote 'return;'. And I forbid the other operation in OnReportDragDropCompleted() method. But the item still disappear in control A and appear in control B. So,How to roll back a drag and drop operation? Thanks very much.