textBox5.LostFocus += new EventHandler(txt_LostFocus); //失去焦点后发生事件
textBox5.GotFocus += new EventHandler(txt_GotFocus); //获取焦点前发生事件
textBox5.MouseClick += new MouseEventHandler(textBox5_MouseClick); // 鼠标点击事件
转载于:https://www.cnblogs.com/hanje/p/10735851.html