winform程序这样绑定DataSet为何数据时空,哪里有问题

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private void button1_Click(object sender, EventArgs e)
      {
         GrapeCity.ActiveReports.PageReport rpt = new GrapeCity.ActiveReports.PageReport(new System.IO.FileInfo(@"PageReport1.rdlx"));
         rpt.Document.LocateDataSource += new GrapeCity.ActiveReports.LocateDataSourceEventHandler(locatedata1);
         GrapeCity.ActiveReports.Document.PageDocument rpdt = new GrapeCity.ActiveReports.Document.PageDocument(rpt);
         this.viewer1.LoadDocument(rpdt);
      }
      private void locatedata1(object cender, GrapeCity.ActiveReports.LocateDataSourceEventArgs args)
      {
         if (args.DataSourceName == "DataSource1" && args.DataSetName == "DataSet1")
         {
               DataSet ds =DBHelperSQL.Query("select * from Hj_basicinfo");
            args.Data = ds.Tables[0];
         }
      }