System.Web.HttpResponse.ClearHeaders C# (CSharp) Method

		public void ClearHeaders ()
		{
			if (headers_sent)
				throw new HttpException ("headers have been already sent");

			// Reset the special case headers.
			content_length = -1;
			content_type = "text/html";
			transfer_encoding = null;
			user_cache_control = "private";
			if (cache_policy != null)
				cache_policy.Cacheability = HttpCacheability.Private;

			if (headers != null)
				headers.Clear ();
		}

        public static void ExportGridViewToExcel(string strFileName, DataTable dt, System.Web.HttpResponse response)
        {
            System.IO.StringWriter             tw     = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter       hw     = new System.Web.UI.HtmlTextWriter(tw);
            System.Web.UI.WebControls.DataGrid dgGrid = new System.Web.UI.WebControls.DataGrid();
            dgGrid.DataSource = dt;
            dgGrid.DataBind();

            //Get the HTML for the control.


            dgGrid.RenderControl(hw);

            ////Write the HTML back to the browser.
            ////Response.ContentType = application/vnd.ms-excel;
            //response.ContentType = "application/vnd.ms-excel";
            //response.AppendHeader("Content-Disposition", "attachment; filename=" + strFileName + ".xls");
            //response.Write(tw.ToString());
            //response.End();


            byte[] bytes = System.Text.Encoding.Default.GetBytes(tw.ToString());
            // Now that you have all the bytes representing the PDF report, buffer it and send it to the client.
            response.Buffer = true;
            response.Clear();
            response.ClearContent();
            response.ClearHeaders();
            response.ContentType     = "application/vnd.ms-excel";
            response.ContentEncoding = System.Text.Encoding.Unicode;
            response.AddHeader("content-disposition", "attachment; filename=" + strFileName + ".xls");
            response.BinaryWrite(bytes); // create the file
            response.End();              // send it to the client to download
        }