Crystal Report未加载且没有错误消息

Question

我正在从SQL Server 2014在VS-2012中生成简单的Crystal Report，遗憾的是它没有在浏览器中加载/显示内容。显示没有错误。

我做的是，添加了Project，添加了水晶报表并配置了SQL Server数据库，拖放项目，Visual Studio中的预览正确显示为SQL Server中的数据。我没有添加任何额外的数据集或DataTables，因为我直接从SQL服务器获取数据

这是代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.Odbc;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;

namespace CrystalReports
{
    public partial class ShowReports : System.Web.UI.Page
    {
        //SqlConnection scon = new SqlConnection(ConfigurationManager.ConnectionStrings["DatabaseString"].ConnectionString);
        protected void Page_Load(object sender, EventArgs e)
        {


            if (!IsPostBack)
               {
                    CrystalReportViewer1.Visible = false;
                    //CrystalReportViewer1.RefreshReport();
               }
        }


        protected void Button1_Click1(object sender, EventArgs e)
        {
            ReportDocument myReportDocument = new ReportDocument();
            string reportPath = Server.MapPath(@"CrystalReport1.rpt");
            myReportDocument.Load(reportPath);
            string constring = ConfigurationManager.ConnectionStrings["DatabaseString"].ConnectionString;
            SqlConnection con = new SqlConnection(constring);
            string query = "SELECT * FROM tblCustomer";
 con.Open();
            SqlCommand cmd = new SqlCommand(query, con);
            cmd.CommandType = CommandType.Text;
            DataTable dt = new DataTable();

            SqlDataAdapter adp = new SqlDataAdapter();
            adp.SelectCommand = cmd;

            adp.Fill(dt);
            myReportDocument.SetDataSource(dt);
            CrystalReportViewer1.ReportSource = myReportDocument;
            CrystalReportViewer1.Visible = true;

        }
    }
}