ฟ้อง error ตัวนี้ค่ะ Column '' does not belong to table tbMAgent. asp.net c#

protected void Button2_Click(object sender, EventArgs e)
    {
        string StrConn3 = WebConfigurationManager.ConnectionStrings["BaseMungthai"].ToString();
        SqlConnection Conn3 = new SqlConnection(StrConn3);
        Conn3.Open();
        string sqlProduct3;

        sqlProduct3 = " SELECT  tbMAgent.AgentCode,tbMAgent.AgentName,tbMAO.AoCode,tbMAO.AoName FROM tbMAgent  INNER JOIN tbMAO ON tbMAgent.AgentID = tbMAO.AoID where tbMAgent.AgentCode = '" + TextBox1.Text + "' ";

        SqlDataAdapter da3 = new SqlDataAdapter(sqlProduct3, Conn3);
        DataSet ds3 = new DataSet();
        da3.Fill(ds3, "tbMAgent");
       

        //string a;
       // Session["AgentID"] = Label1.Text;

      CrystalDecisions.CrystalReports.Engine.ReportDocument rpt =new CrystalDecisions.CrystalReports.Engine.ReportDocument();

        rpt.Load(Server.MapPath("CrystalReport1.rpt"));
        rpt.SetDatabaseLogon("NID-67D182B", "thai");

        rpt.SetDataSource(sqlProduct3.ToList());   //ฟ้อง error ตรงประโยคนี้ค่ะ ว่า Column '' does not belong to table tbMAgent
        

    }