如何利用所有按钮的按钮点击事件来调用函数？

Let me explain further. Let's say I have 20 buttons on a form, and in the all of the button's click event I want to call a specific function, instead of placing the calling to that function in each click event, is there a way to call it from any of the click events without having to place the code in each click event?Let me explain further. Let's say I have 20 but