private void button3_Click(object sender, EventArgs e)
        {
            //隐藏窗体
            this.Visible = false;
            //图标显示在托盘区
            notifyIcon1.Visible = true;
            notifyIcon1.ShowBalloonTip(2000, "提示", "双击图标恢复", ToolTipIcon.Info);
        }

        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
                //显示窗体
                this.Visible = true;
                //激活窗体并给予它焦点
                this.Activate();
                //托盘区图标隐藏
                notifyIcon1.Visible = false;
        }

private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("是否确认退出程序？", "退出", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
            {
                // 关闭所有的线程
                this.Dispose();
                this.Close();
            }
        }

        private void 还原ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Visible = true;
        }