public partial class Form1 : Form 
   { 
     private bool exit; 
  
     //在FormClosing中加如下代码 
     private void Form1_FormClosing(object sender, FormClosingEventArgs e) 
     { 
       if (e.CloseReason == CloseReason.UserClosing) 
       { 
         if (!exit) 
         { 
           e.Cancel = true; 
         } 
       } 
     } 
  
     //在托盘控件的右键退出菜单中加如下代码 
     private void quickMenuExit_Click(object sender, EventArgs e) 
     { 
       exit = true; 
       this.Close(); 
     } 
   }