1,按下Enter触发事件
        private void txt_UserId_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
//或者其他事件
                this.btn_Login_Click(null, null);
            }
        }
2,Tab切换顺序,依次点击控件即可

来源:https://www.cnblogs.com/baozi789654/p/12573335.html