按回车键可以从一个控件跳到另一个控件

 private void Form1_Load(object sender, EventArgs e)
        {
            this.KeyPreview = true;
        }

        private void Form1_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                SendKeys.Send("{tab}");
            }
        }