I have one tree view here i have tried to fire the DragOver event for the TreeView. but it could not fired.
 
Code Snippet :
 
this.trvw_Schemas.DragOver += trvw_Schemas_PreviewDragOver; 
 
        void trvw_Schemas_PreviewDragOver(object sender, DragEventArgs e)
        {
        }
 Please let us know if anyone have the Answer