主要程式碼：

        int i = 0;
        bool b = false;
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            i = i ^ 1; //做 xor 運算 ，按一下 True ，再按一下 False......... 
            b = Convert.ToBoolean(i);
            if (b)
            {
                pictureBox1.Image = Properties.Resources.switch_on;
            }
            else
            {
                pictureBox1.Image = Properties.Resources.switch_off;
            } 
        }

示例：
Switch_Button

範例檔：
https://mega.nz/#!fCJjHa7R!BBXSQOXM7fUFSYCTJA7KJVO8WAM0MKEZaEldF5ZMi1Y

Last modification：December 3, 2018
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