Problem having opening crystal report from VS 2008 to VS 2010

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C#

After I converted an existing windows application from VS 2008 to VS 2010, then I got this error when I tried to open Crystal Reports when I use this code-

ds.Tables[0].Rows.Add(dr);
CrystalReport1 crreport = new CrystalReport1();
crreport.SetDataSource(ds.Tables[0]); // this line gives exception
crystalReportViewer1.ReportSource = crreport;
crystalReportViewer1.Refresh();

and it gives exception :- Data Source Exception handled.
Please help me.