Ok u can do it very easily
first drag and drop that viewer and give a combo box on the form with lits of all reports
and a button from which the report will get fired
on that button code the following
if combo1.text = "this" then CRV.ReportSource = "Report1.rpt"
else if if combo1.text = "this1" then CRV.ReportSource = "Report2.rpt"
.
.
.
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and just like that




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