GridView+联接水晶报表解决办法_.NET报表

GridView+联接水晶报表
各位大虾,请帮个忙,我做了一个GridView显示一个表1中的数据,通过表1中的关键字GCRCLMLH,作为选择,通过水晶报表显示出表2和表3中的部门数据.其中表2和表3和表1都是通过关键字GCRCLMLH作为主外键的.可是现在我点选择,总是提示我水晶报表生成失败,不知是什么原因.
HTML
<asp:GridView ID="GridView1"  OnPageIndexChanging="GridView1_PageIndexChanging"
        runat="server" AutoGenerateColumns="False"
        width="100%"  EmptyDataText="没有符合查询条件的数据！" AllowPaging="True"
        DataKeyNames="GCRCLMLH" onpageindexchanged="GridView1_PageIndexChanged"
        onselectedindexchanging="GridView1_SelectedIndexChanging"   >
<CR:CrystalReportSource ID="CrystalReportSource1" runat="server">
        <Report FileName="CG.rpt">
            <DataSources>
                <CR:DataSourceRef DataSourceID="SqlDataSource1" />
            </DataSources>
            <Parameters>
                <CR:ControlParameter ControlID="GridView1" ConvertEmptyStringToNull="False"
                    DefaultValue="" Name="newParameter1" PropertyName="SelectedValue"
                    ReportName="" />
            </Parameters>
        </Report>
    </CR:CrystalReportSource>

C#

private void ConfigureCrystalReports()
    {
        ReportDocument myReport;
        String cn = @"Data Source=127.0.0.1;Initial Catalog=wcexxku;User ID=sa1;Password=sa";

        SqlDataAdapter sqlAdapt = new SqlDataAdapter();
        SqlConnection conn = new SqlConnection(cn);
        string sqlStr = "select HTXMB.[GCRCLMLH],CLB.*,CLCGB.* from HTXMB INNER JOIN CLB ON HTXMB.GCRCLMLH = CLB.GCRCLMLH INNER JOIN CLCGB ON CLB.GCRCLMLH=CLCGB.GCRCLMLH  WHERE HTXMB.[GCRCLMLH]= " + GridView1.SelectedDataKey.Value.ToString();
        sqlAdapt = new SqlDataAdapter(sqlStr, conn);
        DataSet1 dt1 = new DataSet1();
        sqlAdapt.Fill(dt1, "myTable");

        myReport = new ReportDocument();
        myReport.Load(Server.MapPath("../CG.rpt"));

        myReport.SetDataSource(dt1);
        CrystalReportViewer1.ReportSource = myReport;}
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>