asp.ent下合并两个结构相同的DataTable

/// <summary>
/// 合并两个相同的datatable,返回合并后的结果
/// </summary>
/// <param name="dt1"></param>
/// <param name="dt2"></param>
/// <returns></returns>
public datatable combinethesamedatatable(datatable dt1, datatable dt2)
{
if (dt1.rows.count == 0 && dt2.rows.count == 0)
{
return new datatable();
}
if (dt1.rows.count == 0)
{
return dt2;
}
if (dt2.rows.count == 0)
{
return dt1;
}
dataset ds = new dataset();
ds.tables.add(dt1.copy());
ds.merge(dt2.copy());
return ds.tables[0];
}