怎么多次改变背景颜色
先把textBox1的背景色定为绿色,后在button1的Click事件中写:this.textBox1.BackColor=System.Drawing.Color.Black;
这样textBox1的背景色就变成了黑色,现在想实现:每点一下按钮,背景色就改变一下.这样的功能怎么实现呢?

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