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// Create the 1st report and generate its document.
  XtraReport1 report1 = new XtraReport1();
 report1.CreateDocument(); 
// Create the 2nd report and generate its document. 
 XtraReport2 report2 = new XtraReport2(); 
report2.CreateDocument();
 // Add all pages of the 2nd report to the end of the 1st report. 
 report1.Pages.AddRange(report2.Pages);
 // Reset all page numbers in the resulting document. 
 report1.PrintingSystem.ContinuousPageNumbering = true; 
// Create a Print Tool and show the Print Preview form.
  ReportPrintTool printTool = new ReportPrintTool(report1); 

printTool.ShowPreviewDialog(); 

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