C#报警操作（发出声音——bee~~~~）有用的小程序哦！

using  System;  
 using  System.Runtime.InteropServices;  
 class  test  
 {  
            [DllImport("kernel32.dll")]  
            private  static  extern  int  Beep(int  dwFreq  ,int  dwDuration)  ;  
  
            public  static  void  Main()  
            {  
                        int  a=0X7FF;  
                        int  b=1000;  
                        Beep(a,b);  
                    }  
 }