public   class  Rand
    {
         ///   <summary> 
         ///  生成隨 機數字
         ///   </summary> 
         ///   <param name="length"> 生成長度 </param> 
         ///   <returns></returns> 
         public   static   string  Number( int  Length)
        {
             return  Number(Length,  false );
        }

         ///   <summary> 
         ///  生成隨 機數字
         ///   </summary> 
         ///   <param name="Length"> 生成長度 </param> 
         ///   <param name="Sleep"> 是否要在生成前將當前執行緒阻止以避免重複 </param> 
         ///   <returns></returns> 
         public   static   string  Number( int  Length, bool  Sleep)
        {
             if (Sleep)
                System.Threading.Thread.Sleep( 3 );
             string  result  =   "" ;
            System.Random random  =   new  Random();
             for  ( int  i  =   0 ; i  <  Length; i ++ )
            {
                result  +=  random.Next( 10 ).ToString();
            }
             return  result;
        }

         ///   <summary> 
         ///  生成隨 機字母與數字
         ///   </summary> 
         ///   <param name="IntStr"> 生成長度 </param> 
         ///   <returns></returns> 
         public   static   string  Str( int  Length)
        {
             return  Str(Length,  false );
        }
         ///   <summary> 
         ///  生成隨 機字母與數字
         ///   </summary> 
         ///   <param name="Length"> 生成長度 </param> 
         ///   <param name="Sleep"> 是否要在生成前將當前執行緒阻止以避免重複 </param> 
         ///   <returns></returns> 
         public   static   string  Str( int  Length,  bool  Sleep)
        {
             if (Sleep)
                System.Threading.Thread.Sleep( 3 );
             char [] Pattern  =   new   char [] {  ' 0 ' ,  ' 1 ' ,  ' 2 ' ,  ' 3 ' ,  ' 4 ' ,  ' 5 ' ,  ' 6 ' ,  ' 7 ' ,  ' 8 ' ,  ' 9 ' ,  ' A ' ,  ' B ' ,  ' C ' ,  ' D ' ,  ' E ' ,  ' F ' ,  ' G ' ,  ' H ' ,  ' I ' ,  ' J ' ,  ' K ' ,  ' L ' ,  ' M ' ,  ' N ' ,  ' O ' ,  ' P ' ,  ' Q ' ,  ' R ' ,  ' S ' ,  ' T ' ,  ' U ' ,  ' V ' ,  ' W ' ,  ' X ' ,  ' Y ' ,  ' Z '  };
             string  result  =   "" ;
             int  n  =  Pattern.Length;
            System.Random random  =   new  Random( ~ unchecked (( int )DateTime.Now.Ticks));
             for  ( int  i  =   0 ; i  <  Length; i ++ )
            {
                 int  rnd  =  random.Next( 0 ,n);
                result  +=  Pattern[rnd];
            }
             return  result;
        }


         ///   <summary> 
         ///  生成隨 機純字母隨機數
         ///   </summary> 
         ///   <param name="IntStr"> 生成長度 </param> 
         ///   <returns></returns> 
         public   static   string  Str_char( int  Length)
        {
             return  Str_char(Length,  false );
        }

         ///   <summary> 
         ///  生成隨 機純字母隨機數
         ///   </summary> 
         ///   <param name="Length"> 生成長度 </param> 
         ///   <param name="Sleep"> 是否要在生成前將當前執行緒阻止以避免重複 </param> 
         ///   <returns></returns> 
         public   static   string  Str_char( int  Length,  bool  Sleep)
        {
             if  (Sleep) System.Threading.Thread.Sleep( 3 );
             char [] Pattern  =   new   char [] {  ' A ' ,  ' B ' ,  ' C ' ,  ' D ' ,  ' E ' ,  ' F ' ,  ' G ' ,  ' H ' ,  ' I ' ,  ' J ' ,  ' K ' ,  ' L ' ,  ' M ' ,  ' N ' ,  ' O ' ,  ' P ' ,  ' Q ' ,  ' R ' ,  ' S ' ,  ' T ' ,  ' U ' ,  ' V ' ,  ' W ' ,  ' X ' ,  ' Y ' ,  ' Z '  };
             string  result  =   "" ;
             int  n  =  Pattern.Length;
            System.Random random  =   new  Random( ~ unchecked (( int )DateTime.Now.Ticks));
             for  ( int  i  =   0 ; i  <  Length; i ++ )
            {
                 int  rnd  =  random.Next( 0 , n);
                result  +=  Pattern[rnd];
            }
             return  result;
        }
    }