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a problem with crystal report

I designed a report with crystal report,it was binded to a windows form with
the following code , but every time I ran the form ,there was no report page
displayed in the form,why?

preview_form_lo ad()
{
report_class report_obj=new report_class();
CrystalReportVi ewer.reportsour ce=report_obj;

}
Nov 16 '05 #1
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