activereports 绑定动态数据源问题

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amespace WebApplication5
{
public partial class WebForm1 : System.Web.UI.Page
{
   protected void page_Load(object sender, EventArgs e)
      {
         if (IsPostBack)
         {
            return;
         }
         GrapeCity.ActiveReports.PageReport report = new GrapeCity.ActiveReports.PageReport(new System.IO.FileInfo(Server.MapPath(@"Report1.rdlx")));

         report.Document.LocateDataSource += new GrapeCity.ActiveReports.LocateDataSourceEventHandler(WebViewer1_LocateDataSource);

      this.WebViewer1.Report = report;
      }

   protected void WebViewer1_LocateDataSource(object sender, GrapeCity.ActiveReports.LocateDataSourceEventArgs args)
      {
         if (args.DataSourceName == "DataSource1")
         {
            if (args.DataSetName == "DataSet1")
            {
                  args.Data = GetDataSource();
            }
         }
      }
      private object GetDataSource()
      {
         DataTable dt = new DataTable();
         dt.Columns.Add("产品编号");
         dt.Columns.Add("产品名称");
         dt.Columns.Add("单价");
         dt.Columns.Add("库存量");
         dt.Rows.Add("A10002", "苹果", 20, 50);
         dt.Rows.Add("A15681", "香蕉", 20, 50);
         dt.Rows.Add("A15681", "菠萝", 20, 50);
         return dt;
      }

}
}
为什么走不到这个方法