crystal report populated at runtime

try
            {
                ReportDocument cryRpt = new ReportDocument();
              
                cryRpt.Load(@"C:\Users\Avi\Documents\Store backup\1Apr\store\Bill.rpt");

                con.Open();
                adp = new SqlDataAdapter("Select * from Store_Purchasebill where Bill_no=" + bill + "", con);
                DataSet ds = new DataSet();
                adp.Fill(ds, "Store_Purchasebill");

                if (ds.Tables[0].Rows.Count > 0)
                {
                    //.......Put the whole part of report bellow..............
                    cryRpt.Load(@"C:\Users\Avi\Documents\Store backup\1Apr\store\Bill.rpt");
                    <big>cryRpt.SetDataSource(ds);// here i get error </big>

                    crystalReportViewer1.ReportSource = cryRpt;
                    crystalReportViewer1.Refresh();

                }
                             
            }
            catch (Exception se)
            {
                MessageBox.Show(se.Message.ToString());
            }