How to drag and drop the merged Cells in WinForms GridControl?

//QueryCanOleDragRange event.
void gridControl1_QueryCanOleDragRange(object sender, GridQueryCanOleDragRangeEventArgs e)
{
      if (e.Range.Left != e.Range.Right || e.Range.Top!=e.Range.Bottom)
      this.gridControl1.Selections.Add(e.Range);
}

‘QueryCanOleDragRange event.
Private Sub gridControl1_QueryCanOleDragRange(ByVal sender As Object, ByVal e As GridQueryCanOleDragRangeEventArgs)
    If e.Range.Left <> e.Range.Right OrElse e.Range.Top<>e.Range.Bottom Then
        Me.gridControl1.Selections.Add(e.Range)
    End If
End Sub