Add a header to a gridview that groups some columns

    Protected Sub ReportGridView_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.DataBound
        Dim ExtraTable As Table = GridView1.Controls(0)
        Dim ExtraGridViewRow As New GridViewRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal)
        Dim ExtraTableHeaderCell1 As New TableHeaderCell
        ExtraTableHeaderCell1.Text = "First 2 Columns"
        ExtraTableHeaderCell1.ColumnSpan = 2
        ExtraGridViewRow.Cells.Add(ExtraTableHeaderCell1)
        Dim ExtraTableHeaderCell2 As New TableHeaderCell
        ExtraTableHeaderCell2.Text = "Next 3 Columns"
        ExtraTableHeaderCell2.ColumnSpan = 3
        ExtraGridViewRow.Cells.Add(ExtraTableHeaderCell2)
        Dim ExtraTableHeaderCell3 As New TableHeaderCell
        ExtraTableHeaderCell3.Text = "Last 4 Columns"
        ExtraTableHeaderCell3.ColumnSpan = 4
        ExtraGridViewRow.Cells.Add(ExtraTableHeaderCell3)
    End Sub