datagridview 序號

參考
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 //增行
private void grdDetail_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
{
    RedoSerialNo();
}

//删行
private void grdDetail_RowsRemoved(object sender, DataGridViewRowsRemovedEventArgs e)
{
    RedoSerialNo();
}

//取得序列号
private void RedoSerialNo()
{
    for (int i = 0; i < grdDetail.RowCount; ++i)
    {
        grdDetail[0, i].Value = i + 1;
    }
}