System.Web.UI.Control.RenderControl C# (CSharp) Method

		public virtual void RenderControl (HtmlTextWriter writer)
		{
			if (this.adapter != null) {
				RenderControl (writer, this.adapter);
				return;
			}

			if ((stateMask & VISIBLE) != 0) {
				HttpContext ctx = Context;
				TraceContext trace = (ctx != null) ? ctx.Trace : null;
				int pos = 0;
				if ((trace != null) && trace.IsEnabled)
					pos = ctx.Response.GetOutputByteCount ();

				Render (writer);
				if ((trace != null) && trace.IsEnabled) {
					int size = ctx.Response.GetOutputByteCount () - pos;
					trace.SaveSize (this, size >= 0 ? size : 0);
				}
			}
		}

        public void ExportDataGridToExcel(System.Web.UI.Control ctrl, System.Web.HttpResponse response)
        {
            response.Clear();
            response.Buffer = true;
            response.Cache.SetCacheability(HttpCacheability.NoCache);
            response.ContentType = "application/vnd.ms-excel";
            response.AddHeader("content-disposition", "attachment;filename=Flash Report.xls");
            response.Charset     = "";
            this.EnableViewState = false;

            System.IO.StringWriter       oStringWriter   = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);

            //this.ClearControls(ctrl);
            ctrl.RenderControl(oHtmlTextWriter);

            // set content type and character set to cope with european chars like the umlaut.
            response.Write("<meta http-equiv=Content-Type content=\"text/html; charset=utf-8\">" + Environment.NewLine);

            // add the style props to get the page orientation
            response.Write(AddExcelStyling());
            response.Write("<span style='font-size: 11pt; font-family: Arial; font-weight:bold;'>" + "REPORTE EXCESO DE INVENTARIO" + indicadorTexto + "</span>");
            response.Write("<br>");
            response.Write("<span style='font-size: 10pt; font-family: Arial;'>" + lblLeyenda.Text + "</span>");
            response.Write("<br>");
            response.Write("<br>");
            response.Write(oStringWriter.ToString());
            response.Write("</body>");
            response.Write("</html>");

            response.End();
        }