/// <summary>
        /// 窗体加载事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {
            foreach (object obj in panel1.Controls)
            {
                if (obj is TextBox)
                {
                    ((TextBox)obj).MouseClick += new MouseEventHandler(TextBox_MouseClick);        //给panel1控件中每个文本框订阅 Enter 事件
                }
            }
        }

        /// <summary>
        /// 文本框的鼠标单击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void TextBox_MouseClick(object sender, MouseEventArgs e)
        {
            ((TextBox)sender).SelectionStart = ((TextBox)sender).Text.Length;
        }