Crystal Reports in ASP.NET using VS 2010

private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection cnn ;
            string connectionString = null;
            string sql = null;

            connectionString = "data source=SERVERNAME;initial catalog=DATABASENAME;user id=USERNAME;password=PASSWORD;";
            cnn = new SqlConnection(connectionString);
            cnn.Open();
            sql = "SELECT Product_id,Product_name,Product_price FROM Product";
            SqlDataAdapter dscmd = new SqlDataAdapter(sql, cnn);
            DataSet1 ds = new DataSet1();
            dscmd.Fill(ds, "Product");
            MessageBox.Show (ds.Tables[1].Rows.Count.ToString());
            cnn.Close();

            CrystalReport1 objRpt = new CrystalReport1();
            objRpt.SetDataSource(ds.Tables[1]);
            crystalReportViewer1.ReportSource = objRpt;
            crystalReportViewer1.Refresh();
        }