ปัญหาการสร้าง Crystal Report มีการร้องขอการเชื่อมต่อฐานข้อมูล

protected void Page_Load(object sender, EventArgs e)
        {
           
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            loadReport();
        }
        protected void loadReport()
        {
            ReportDocument rpt = new ReportDocument();
            rpt.Load(Server.MapPath("CrystalReport1.rpt"));
            rpt.SetDatabaseLogon("sa", "1234", "localhost", "Work");
            rpt.SetParameterValue("Emp_ID", txtEmp_ID.Text);
            rpt.SetParameterValue("Year_Work", DropYear.SelectedValue);
            rpt.SetParameterValue("Month_Work", DropMonth.SelectedValue);
            CrystalReportViewer1.ReportSource = rpt;
            CrystalReportViewer1.DataBind();
            //rpt.RecordSelectionFormula="{tb.colum}='"+DropYear.SelectedValue+"'";
            //CrystalReportViewer1.RefreshReport();
        }

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {

            }
            else if (IsPostBack)
            {
                loadReport();
            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            loadReport();

        }
        protected void loadReport()
        {
            ReportDocument rpt = new ReportDocument();
            rpt.Load(Server.MapPath("CrystalReport1.rpt"));
            rpt.SetDatabaseLogon("sa", "1234", "localhost", "Work");
            rpt.SetParameterValue("Emp_ID", txtEmp_ID.Text);
            rpt.SetParameterValue("Year_Work", DropYear.SelectedValue);
            rpt.SetParameterValue("Month_Work", DropMonth.SelectedValue);
            CrystalReportViewer1.ReportSource = rpt;
            CrystalReportViewer1.DataBind();
            //rpt.RecordSelectionFormula="{tb.colum}='"+DropYear.SelectedValue+"'";
            //CrystalReportViewer1.RefreshReport();
        }