tab ,tab+shift

private void txtMInfo_KeyDown(object sender, KeyEventArgs e)
{
        // 向后跳转
        if ( e.KeyCode == Keys.Enter || e.KeyCode == Keys.Right )
        {
                SendKeys.Send("{TAB}");
        }
        // 向前回跳
        else if ( e.KeyCode == Keys.Left || e.KeyCode == Keys.Up )
        {
                SendKeys.Send("+{TAB}");
        }
}