ASP.NET

Private Sub GridView1_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.PreRender
        Dim GV As GridView = CType(sender, GridView)
        Dim Tbl As Table = CType(GV.Controls(0), Table)
        Tbl.Controls.AddAt(index, AddEmptyRow)
End Sub

Function AddEmptyRow() As GridViewRow
        Dim GVR As GridViewRow = New GridViewRow(0, 0, DataControlRowType.EmptyDataRow, DataControlRowState.Normal)
        Dim cell As TableCell = New TableCell
        cell.ColumnSpan = ColumnCount
        cell.Text = " "
        GVR.Cells.Add(cell)
        Return GVR
End Function