Adding subheaders into the gridview rowdatabound event

First Bind data to gridview control in page load event.

   private string Column1 = "";

  

    protected void grd_RowDataBound(object sender, GridViewRowEventArgs e)

    {

       

            

        if (e.Row.RowType == DataControlRowType.DataRow)

        {

            DataRowView dr = (DataRowView)e.Row.DataItem;

            Table tbl = e.Row.Parent as Table;

            if (Column1!= dr["Column1"].ToString())

            {

                Column1= dr["Column1"].ToString();

                GridViewRow rowHeader = new GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal);

                Literal newCells = new Literal();

                newCells.Text = dr["Header"].ToString();

                TableHeaderCell headerCell = new TableHeaderCell();

                headerCell.Controls.Add(newCells);

                headerCell.ColumnSpan = e.Row.Cells.Count;

                headerCell.BackColor = System.Drawing.Color.Silver;

                headerCell.HorizontalAlign = HorizontalAlign.Left;

                rowHeader.Cells.Add(headerCell);

                rowHeader.Visible = true;

                grd.Controls[0].Controls.AddAt(tbl.Rows.Count-1, rowHeader);

            }

                           

        }

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