crystal report - report document does not contain the definition for setdatasource?

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ASP.NET

I have created a crystal report and bind the dataset to it.everything goes good but where i'm sticking is in the code behind i'm getting the above error near the "rep.setdatasource".
here is my code. (vs2008 ,net framework 3.5 and c#)

protected void  Viewbutton_Click(object sender, EventArgs e)
            {
                string path = Server.MapPath(@"CrystalReport.rpt");
                SqlConnection con = new SqlConnection("Data Source=HOME-PC\\SQLEXPRESS;Initial Catalog=test1;Persist Security Info=True;User ID=user1;Password=user1");
                con.Open();
                SqlCommand cmd = new SqlCommand();
                cmd = new SqlCommand("select * EMaster", con);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataSet ds = new DataSet();
                da.Fill(ds, "Infotable");
                ReportDocument rep = new ReportDocument();
                rep.Load((path));
                CrystalReportViewer1.RefreshReport();
                rep.SetDataSource(ds.Tables["Infotable"]);
                //rep.SetDataSource(ds.Tables[0]);
                CrystalReportViewer1.ReportSource = rep;
            }

Can anyone please figure my flaws.
Thanks in advance.