工作需要，要实现windows应用程序中用的datagrid具有分页功能，不知道ms怎么想的，asp.net的datagrid有这样的功能，为什么不在winForm的datagrid里面提供这样的功能，还得让我费这么大劲儿来重写这个控件，真是麻烦。

首先，我们要做一个类来继承系统的datagrid:

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

namespace oilx.PagingDataGrid

{

public class PagingDataGrid : DataGrid

{

  // 声明一些必要的全局变量。

private System.ComponentModel.Container components = null;

                      /// <summary>

                      ///                  

/// </summary>

                      private const int MarkerWith = 14;

                      /// <summary>

                      ///

                      /// </summary>

                      private Point      _pointTopLeft; 

                      /// <summary>

                      ///

                      /// </summary>

                      private int _row = 1;

                      //

                      private int _rowNumberFigure = 0;

                      private bool _zeroPadding = false;

                      /// <summary>

                      ///

                      /// </summary>

                      private string _rowHeaderCaption = String.Empty;

                      /// <summary>