Dynamic header cells using RenderHeader

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C#3.5

hi,
i am working on dynamic header cells for grid
i have these two tables

1st grid : SNO DPMU Established
2nd grid : SNO TPMU Established

and my code is

 public void RenderHeader(HtmlTextWriter writer, Control ctl)
        {
            ArrayList Headers = DynamicHeaders(headevalues);

            for (int j = 0; j < Headers.Count; j++)
            {
                if (j > 0)
                {
                    writer.Write("<table><tbody><tr>");
                }
                List<dynamicheadercell> HeaderRow = (List<dynamicheadercell>)Headers[j];
                for (int i = 0; i < HeaderRow.Count; i++)
                {
                    TableCell item = new TableCell();
                    item.Text = HeaderRow[i].Header;
                    item.ColumnSpan = HeaderRow[i].ColSpan;
                    item.RowSpan = HeaderRow[i].RowSpan;
                    item.HorizontalAlign = HorizontalAlign.Center;
                    item.VerticalAlign = VerticalAlign.Middle;
                    item.Font.Bold = true;
                    item.Font.Name = "Calibri";
                    item.Font.Size = 11;
                    item.BackColor = Color.FromName("#e4e4e4");
                    // item.BackColor = Color.Transparent;
                    item.RenderControl(writer);

                }
                if (j < Headers.Count - 1)
                {
                    writer.Write("</dynamicheadercell></dynamicheadercell></tr></tbody></table>");
                }
                //writer.WriteEndTag("TR");
                //if (j < Headers.Count - 1)
                //    writer.RenderBeginTag("TR");
            }

        }


protected void dtgvDataReports_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Header)
        {
            dm.headervalues("SNO,DPMU,Established");
            e.Row.SetRenderMethodDelegate(new RenderMethod(dm.RenderHeader));
        }
    }

protected void dtgvDataReports_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
dm.headervalues("SNO,TPMU,Established"");
e.Row.SetRenderMethodDelegate(new RenderMethod(dm.RenderHeader));
}
}

using this row databound 1st grid is fine but 2nd grid also showing first grid headers instead of 2nd grid headers, then i again write another RenderHeader1 for 2nd grid...my question is if i have n grids is it necessary to write no. of RenderHeaders or any code for that plz help me in this situation

public void RenderHeader1(HtmlTextWriter writer, Control ctl)
        {

            ArrayList Headers = DynamicHeaders(headevalues);

            for (int j = 0; j < Headers.Count; j++)
            {
                if (j > 0)
                {
                    writer.Write("<table><tbody><tr>");
                }
                List<dynamicheadercell> HeaderRow = (List<dynamicheadercell>)Headers[j];
                for (int i = 0; i < HeaderRow.Count; i++)
                {
                    TableCell item = new TableCell();
                    if (HeaderRow[i].Header == "DPMU")
                    {
                        item.Text = "TPMU";
                    }
                    else
                    {
                        item.Text = HeaderRow[i].Header;
                    }
                    item.ColumnSpan = HeaderRow[i].ColSpan;
                    item.RowSpan = HeaderRow[i].RowSpan;
                    item.HorizontalAlign = HorizontalAlign.Center;
                    item.VerticalAlign = VerticalAlign.Middle;
                    item.Font.Bold = true;
                    item.Font.Name = "Calibri";
                    item.Font.Size = 11;
                    item.BackColor = Color.FromName("#e4e4e4");
                    // item.BackColor = Color.Transparent;
                    item.RenderControl(writer);

                }
                if (j < Headers.Count - 1)
                {
                    writer.Write("</dynamicheadercell></dynamicheadercell></tr></tbody></table>");
                }
            }

        }

if i have n grids then what i will do instead of writing no. of RenderHeaders
please help me very urgent task it it...
thanks in advance