Out of memory first time report is exported

public void RunReport(string outputFile, int cc, int yr, int wk)
{
     ReportDocument rd = new ReportDocument();
     rd.Load(FullFilePath("myreport.rpt"));
     rd.Refresh();
     rd.SetDatabaseLogon("userid", "password");

     foreach (Table tbl in rd.Database.Tables)
     {
          tbl.LogOnInfo.ConnectionInfo.ServerName = "dbname";
          tbl.LogOnInfo.ConnectionInfo.DatabaseName = "";
          tbl.LogOnInfo.ConnectionInfo.UserID = "userid";
          tbl.LogOnInfo.ConnectionInfo.Password = "password";
     }
     foreach (IConnectionInfo ci in rd.DataSourceConnections)
     {
          ci.SetLogon("userid", "password");
     }
          DiskFileDestinationOptions CrDiskFileDestinationOptions = new DiskFileDestinationOptions();
     ExportOptions CrExportOptions;

     PdfRtfWordFormatOptions pdfFormatOptions = new PdfRtfWordFormatOptions();
     CrDiskFileDestinationOptions.DiskFileName = outputFile;
     CrExportOptions = rd.ExportOptions;
     {
          CrExportOptions.ExportDestinationType = ExportDestinationType.DiskFile;
          CrExportOptions.ExportFormatType = ExportFormatType.PortableDocFormat;
          CrExportOptions.DestinationOptions = CrDiskFileDestinationOptions;
          CrExportOptions.FormatOptions = pdfFormatOptions;
     }

     SetCurrentValuesForParameterField(rd, "IP_COMP_CODE", cc);
     SetCurrentValuesForParameterField(rd, "IP_YEAR", yr);
     SetCurrentValuesForParameterField(rd, "IP_WEEK", wk);
     
     rd.Export();
}