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Disable Drop at Specific Location

In order to disable the drop operation on a specific treeview item, you need to set the boolean RadTreeViewItem property IsDropAllowed to False.

<telerik:RadTreeViewItem Header="Tennis" IsDropAllowed="False"> 

private void DisableDropOnSpecificItem() 
{ 
    radTreeViewItemTennis.IsDropAllowed = false; 
} 

If you want to read more about the Drag and Drop behavior of the RadTreeView, see the main topic about Drag and Drop.