private void TextBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)Keys.Enter)
            {
                //这里要让它激发  Buttonl_Click  事件  忘了怎么写
            }
        }

        private void Buttonl_Click(object sender, EventArgs e)
        {
           .......................
        }