private void Form1_SizeChanged(object sender, EventArgs e)
{
    if (this.WindowState == FormWindowState.Minimized)
    {
        this.ShowInTaskbar = false;//隱藏任務欄標簽
        this.notifyIcon1.Visible = true;//顯示托盤圖標
    }
    else
    {
        this.ShowInTaskbar = true;
        this.notifyIcon1.Visible = false;
    }
}