public string GetRandomColor()
{
        Random RandomNum_First = new Random((int)DateTime.Now.Ticks);
        //  對于C#的隨機數，沒什么好說的
        System.Threading.Thread.Sleep(RandomNum_First.Next(50));
        Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks);

        //  為了在白色背景上顯示，盡量生成深色
        int int_Red = RandomNum_First.Next(256);
        int int_Green = RandomNum_Sencond.Next(256);
        int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green;
int_Blue = (int_Blue > 255) ? 255 : int_Blue;
     return Color.FromArgb(int_Red, int_Green, int_Blue).Name;
}