datatable 分页

    public DataTable GetPagedTable(DataTable dt)
    {
        int PageSize = AspNetPager1.PageSize;
        int PageIndex = AspNetPager1.CurrentPageIndex;

        if (PageIndex == 0)
            return dt;
        DataTable newdt = dt.Copy();
        newdt.Clear();

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

        if (rowbegin >= dt.Rows.Count)
            return newdt;

        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;
    }