private int pageSize = 0; //每页显示行数
  private int pageCurrent = 0; //当前页号
  private int pageCount = 0; //页数＝总记录数/每页显示行数
  private int nCurrent = 0; //当前记录行号
  private int nMax = 0; //总记录数
  private DataTable srcTable = null; //元数据

  private void First_Click(object sender, EventArgs e)
  {
  try
  {
  pageCurrent = 1; //当前页数从1开始
  nCurrent = 0; //当前记录数从0开始

  if (srcTable == null || srcTable.Rows.Count == 0)
  return;

  DataTable table = LoadPageData();
  ChangeDataSoure(table);

  First.Enabled =false;
  Prev.Enabled = false;
  Next.Enabled = true;
  End.Enabled = true;
  }
  catch (Exception ex)
  {
  MessageBox.Show(ex.Message);
  }
  }

  private void Prev_Click(object sender, EventArgs e)
  {
  try
  {
  pageCurrent--;
  nCurrent = pageSize * (pageCurrent - 1);

  if (srcTable == null || srcTable.Rows.Count == 0)
  return;
  DataTable table = LoadPageData();
  ChangeDataSoure(table);

  bool b = pageCurrent <= 1 ? false : true;
  First.Enabled = b;
  Prev.Enabled = b;
  Next.Enabled = true;
  End.Enabled = true;
  }
  catch (Exception ex)
  {
  MessageBox.Show(ex.Message);
  }
  }

  private void Next_Click(object sender, EventArgs e)
  {
  try
  {
  pageCurrent++;
  nCurrent = pageSize * (pageCurrent - 1);

  if (srcTable == null || srcTable.Rows.Count == 0)
  return;
  DataTable table = LoadPageData();
  ChangeDataSoure(table);

  bool b = pageCurrent >= pageCount ? false : true;
  Next.Enabled = b;
  End.Enabled = b;

  First.Enabled = true;
  Prev.Enabled = true;
  }
  catch (Exception ex)
  {
  MessageBox.Show(ex.Message);
  }
  }

  private void End_Click(object sender, EventArgs e)
  {
  try
  {
  pageCurrent = pageCount;
  nCurrent = pageSize * (pageCurrent - 1);

  if (srcTable == null || srcTable.Rows.Count == 0)
  return;

  DataTable table = LoadPageData();
  ChangeDataSoure(table);

  Next.Enabled =false;
  End.Enabled = false;
  First.Enabled = true;
  Prev.Enabled = true;
  }
  catch (Exception ex)
  {
  MessageBox.Show(ex.Message);
  }
  }

  private void InitPageSet()
  {
  pageSize = 30; //设置页面行数
  nMax = srcTable.Rows.Count;
  pageCount = (nMax / pageSize); //计算出总页数

  if ((nMax % pageSize) > 0)
  {
  pageCount++;
  }

  pageCurrent = 1; //当前页数从1开始
  nCurrent = 0; //当前记录数从0开始

  First.Enabled =false;
  Prev.Enabled = false;

  bool b = pageCurrent == pageCount ? false : true;
  Next