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我正在尝试按照以下给出的步骤从表中查询记录来显示报告

http://www.codeproject.com/Articles/166291/Generate-a-report-using-Crystal-Reports-in-Visual

我收到一条错误消息

ds.Tables[0].Merge(dt);

as 不包含“表”的定义，并且找不到接受第一个类型参数的扩展方法“表”（您是否缺少 using 指令或程序集引用？）

在下面的代码中。请帮忙。

Emp 是 Dataset 所在的 xsd 文件名 (Emp.xsd)

protected void Page_Load(object sender, EventArgs e)
    {
        ReportDocument rptDoc = new ReportDocument();
        Emp ds = new Emp(); // Emp is the xsd file name (Emp.xsd)
        DataTable dt = new DataTable();
        // Just set the name of data table
        dt.TableName = "EmployeeStats";
        dt = AB.GetEEmpStats((int)Session["EmpID"]); //Call function to get the     employee statistics

        ds.Tables[0].Merge(dt); <<<<<<<<<<<<<<<<<<< Error at this line

        // .rpt file path
        rptEmpStat.Load(Server.MapPath("EmpStats.rpt"));
        //dataset to the report viewer.
        rptDoc.SetDataSource(ds);
        Emp.ReportSource = rptDoc;
        Emp.RefreshReport();

    }

GetEEmpStats 的代码如下

 public DataTable GetEEmpStats(int ID)
    {
        //Connection string 
        //string sqlCon = <***************>;

        SqlConnection Con = new SqlConnection(sqlCon);
        SqlCommand cmd = new SqlCommand();
        DataSet ds = null;
        SqlDataAdapter adapter;
        try
        {
            Con.Open();
            //Stored procedure 
            cmd.CommandText = "sp_getEmpDetails";
            cmd.CommandType = CommandType.StoredProcedure;
            // input parameter 

            SqlParameter parameter1 = new SqlParameter();
            parameter1.ParameterName = "@ID";
            parameter1.SqlDbType = SqlDbType.Int;
            parameter1.Direction = ParameterDirection.Input;
            parameter1.Value = ID;

            // Add the parameter to the Parameters collection. 
            cmd.Parameters.Add(parameter1);
            cmd.Connection = Con;
            ds = new DataSet();
            adapter = new SqlDataAdapter(cmd);
            adapter.Fill(ds, "EmpDet");
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
        finally
        {
            cmd.Dispose();
            if (Con.State != ConnectionState.Closed)
                Con.Close();
        }
        return ds.Tables[0];
    }
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