Export to Excel in Rdlc

protected void Export(object sender, EventArgs e) {Warning[] warnings;string[] streamIds;string contentType;string encoding;string extension;
//Export the RDLC Report to Byte
Array.byte[] bytes = ReportViewer1.LocalReport.Render(rbFormat.SelectedItem.Value, null, out contentType, out encoding, out extension, out streamIds, out warnings);
//Download the RDLC Report in Word, Excel, PDF and Image
formats.Response.Clear();Response.Buffer = true;Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = contentType;Response.AppendHeader("Content-Disposition", "attachment;
filename=RDLC." + extension);
Response.BinaryWrite(bytes);Response.Flush();Response.End(); }