Presetting Legal size for exported excel file from GridView in aspx

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C#

ASP.NET

Gridview

Hi,

I have a rather difficult requirement from our clients for a Gridview.
Clients would like to preset the Excel file saved from an export out of the GridView content, to Legal size automatically.

Has anyone tackled the above requirement? Is there a way to specify the Legal page size?
The code below is what I have currently for exporting the GridView to an Excel file.

private void ExportToExcel(string p, GridView GridView1)
{
	Response.ClearContent();
	Response.AddHeader("content-disposition", "attachment; filename=" + p);
	Response.ContentType = "application/vnd.xls";
         GridView1.PagerSettings.Visible = false;
         GridView1.DataBind();
         System.IO.StringWriter sw = new System.IO.StringWriter();
	HtmlTextWriter htw = new HtmlTextWriter(sw);
	GridView1.RenderControl(htw);
	Response.Write(sw.ToString());
	Response.End();
         GridView1.PagerSettings.Visible = true;
         GridView1.DataBind();
}