ASP.NET Crystal Report 问题

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using CrystalDecisions.Shared;//水晶报表的引用

using CrystalDecisions.CrystalReports.Engine;//水晶报表的引用

using System.Data.SqlClient;

public partial class EvaluateReport : System.Web.UI.Page

{

string connString = System.Configuration.ConfigurationManager.ConnectionStrings["henry"].ConnectionString;

static string sql = "";

private ReportDocument evaluateDocument;

protected void Page_Load(object sender, EventArgs e)

{

SqlConnection conn = new SqlConnection(connString);

try

{

conn.Open();

}

catch (Exception ex)

{

}

string sql = "select * from evaluate left join class on evaluate.classid=class.classid left join course on evaluate.courseid=course.courseid left join [week] on evaluate.weekid=[week].weekid left join [user] on evaluate.OperatorID=[user].recuid left join times on evaluate.timesid=times.timesid left join teacher on evaluate.teacherid=teacher.teacherid";

SqlDataAdapter da = new SqlDataAdapter(sql, conn);

DataSet ds = new DataSet();

da.Fill(ds,"EvaluateList");

evaluateDocument =new ReportDocument();

string reportPath = Server.MapPath("report1.rpt");

evaluateDocument.Load(reportPath);

evaluateDocument.SetDataSource(ds);

CrystalReportViewer1.ReportSource=evaluateDocument;

}

}

错误提示为



不知是为什么？who can help me ?