Render Crystal Report in different file formats without CrystalReportViewer

public static void RenderCrystalReport(DataSet ResultSet, String ReportLocation, String RenderType,HttpResponse Response)
        {
            MemoryStream oStream = new MemoryStream();
            ReportDocument crystalReport = new ReportDocument();
            crystalReport.Load(HttpContext.Current.Server.MapPath(ReportLocation));
            crystalReport.SetDataSource(ResultSet);

            switch (RenderType)
            {
                case "PDF":
                    oStream = crystalReport.ExportToStream(ExportFormatType.PortableDocFormat) as MemoryStream;
                    Response.Clear();
                    Response.Buffer = true;
                    Response.ContentType = "application/pdf";
                    break;

                case "DOC":
                    oStream = crystalReport.ExportToStream(ExportFormatType.WordForWindows) as MemoryStream;
                    Response.Clear();
                    Response.Buffer = true;
                    Response.ContentType = "application/doc";
                    break;

                case "XLS":
                    oStream = crystalReport.ExportToStream(ExportFormatType.Excel) as MemoryStream;
                    Response.Clear();
                    Response.Buffer = true;
                    Response.ContentType = "application/vnd.ms-excel";
                    break;

            }


            Response.BinaryWrite(oStream.ToArray());
            Response.End();
        }