Asp.net ReportViewer ทำตามตัวอย่าง แต่ติด Error ครับ

protected void Button1_Click(object sender, EventArgs e)
        {
            SqlConnection objConn = new SqlConnection();
            SqlCommand objCmd = new SqlCommand();
            SqlDataAdapter dtAdapter = new SqlDataAdapter();

            DataSet ds = new DataSet();
            DataTable dt = null;
            string strConnString = null;
            string strSQL = null;

            strConnString = "Data Source=(local)\\SQLExpress05;Initial Catalog=KRIS;Integrated Security=SSPI";
            strSQL = "SELECT * FROM reportProduct_V";

            objConn.ConnectionString = strConnString;
            var _with1 = objCmd;
            _with1.Connection = objConn;
            _with1.CommandText = strSQL;
            _with1.CommandType = CommandType.Text;
            dtAdapter.SelectCommand = objCmd;

            dtAdapter.Fill(ds);
            dt = ds.Tables[0];

            dtAdapter = null;
            objConn.Close();
            objConn = null;

            ReportViewer1.LocalReport.DataSources.Add(new ReportDataSource("ReportDataSet_GoodsByDept", dt));
            ReportViewer1.LocalReport.ReportPath = "RepGoodsByDept.rdlc";            
            ReportViewer1.LocalReport.Refresh();

        }