public DataTable GetPagedTable(DataTable dt, int PageIndex, int PageSize)//PageIndex表示第几页，PageSize表示每页的记录数
  {
   if (PageIndex == 0)
    return dt;//0页代表每页数据，直接返回

   DataTable newdt = dt.Copy();
   newdt.Clear();//copy dt的框架

   int rowbegin = (PageIndex - 1) * PageSize;
   int rowend = PageIndex * PageSize;

   if (rowbegin >= dt.Rows.Count)
    return newdt;//源数据记录数小于等于要显示的记录，直接返回dt

   if (rowend > dt.Rows.Count)
    rowend = dt.Rows.Count;
   for (int i = rowbegin; i <= rowend - 1; i++)
   {
    DataRow newdr = newdt.NewRow();
    DataRow dr = dt.Rows[i];
    foreach (DataColumn column in dt.Columns)
    {
     newdr[column.ColumnName] = dr[column.ColumnName];
    }
    newdt.Rows.Add(newdr);
   }
   return newdt;
  }