Converting RDLC reportviewer output to PDF Manually

Sometimes we need to convert out Report output to pdf and at the same time we do not require to show the Report Header.
So report-viewer output has to be converted to pdf manually. For that you can refer to following code.

 public void createPdfReport()

    {

        Warning[] warnings;
        string[] streamids;
        string mimeType;
        string encoding;
        string extension;
        byte[] bytes = this.ReportViewer1.LocalReport.Render("PDF", null, out mimeType, out encoding, out extension, out streamids, out warnings);
        FileStream fs = new FileStream(@"c:\filename.pdf", FileMode.Create);
        fs.Write(bytes, 0, bytes.Length);
        fs.Close();
    }

    protected void Button1_Click1(object sender, EventArgs e)
    {
        createPdfReport();
    }