Load Crystal Report from Physical Path c#

using(CrystalDecisions.CrystalReports.Engine.ReportDocument rd = new ReportDocument()) {
  var path =
    HttpContext.Current.Server.MapPath((@ "~/Reports/rptDatewiseSaleSummaryReport.rpt"));
  rd.Load(path);
  rd.SetDataSource(items);

  string fname = System.Web.HttpContext.Current.Server.MapPath("~/CReports") + "/" + guid.ToString() + "." + type;
  CrystalDecisions.Shared.DiskFileDestinationOptions dfo = new CrystalDecisions.Shared.DiskFileDestinationOptions();
  dfo.DiskFileName = fname;
  switch (type) {
  case "pdf":
    rd.ExportOptions.ExportFormatType = CrystalDecisions.Shared.ExportFormatType.PortableDocFormat;
    break;
  case "xls":
    rd.ExportOptions.ExportFormatType = CrystalDecisions.Shared.ExportFormatType.Excel;
    break;
  }
  rd.ExportOptions.DestinationOptions = dfo;
  rd.ExportOptions.ExportDestinationType = CrystalDecisions.Shared.ExportDestinationType.DiskFile;

  rd.Export();
  rd.Close();
}