问在MSDN水晶报告教程中缺少使用hierarchical_grouping指令

EN

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;

namespace CrystalTest3
{
    public partial class Form1 : Form
    {
        private Hierarchical_Grouping hierarchicalGroupingReport;

        public Form1()
       {
            InitializeComponent();
        }
        private void ConfigureCrystalReports()
        {
            hierarchicalGroupingReport = new Hierarchical_Grouping();
            crystalReportViewer.ReportSource = hierarchicalGroupingReport;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ConfigureCrystalReports(); 
        }
    }
}