Use Interlocked operations : Interlocked : Thread C# Examples

    
using  System;    
using  System.Threading;    
  
class  SharedRes  {  
    public  static  int  count  =  0;  
}  
  
class  IncThread  {    
    public  Thread  thrd;  
    
    public  IncThread(string  name)  {    
        thrd  =  new  Thread(this.run);    
        thrd.Name  =  name;  
        thrd.Start();    
    }    
    
    void  run()  {    
  
        for(int  i=0;  i<100;  i++)  {  
            Thread.Sleep(200);  
            Interlocked.Increment(ref  SharedRes.count);  
            Console.WriteLine(thrd.Name  +  "  count  is  "  +  SharedRes.count);  
        }  
    }    
}    
  
class  DecThread  {    
    public  Thread  thrd;  
    
    public  DecThread(string  name)  {    
        thrd  =  new  Thread(this.run);    
        thrd.Name  =  name;  
        thrd.Start();    
    }    
    
    void  run()  {    
  
        for(int  i=0;  i<100;  i++)  {  
            Thread.Sleep(500);  
            Interlocked.Decrement(ref  SharedRes.count);  
            Console.WriteLine(thrd.Name  +  "  count  is  "  +  SharedRes.count);  
        }  
    }    
}    
    
class  InterdlockedDemo  {    
    public  static  void  Main()  {    
  
        IncThread  mt1  =  new  IncThread("Increment  Thread");    
        DecThread  mt2  =  new  DecThread("Decrement  Thread");    
    
        mt1.thrd.Join();  
        mt2.thrd.Join();  
    }    
}
    
   
  
   

Output

Increment Thread count is 1
Increment Thread count is 2
Decrement Thread count is 1
Increment Thread count is 2
Increment Thread count is 3
Decrement Thread count is 2
Increment Thread count is 3
Increment Thread count is 4
Increment Thread count is 5
Decrement Thread count is 4
Increment Thread count is 5
Increment Thread count is 6
Decrement Thread count is 5
Increment Thread count is 6
Increment Thread count is 7
Increment Thread count is 8
Decrement Thread count is 7
Increment Thread count is 8
Increment Thread count is 9
Decrement Thread count is 8
Increment Thread count is 9
Increment Thread count is 10
Increment Thread count is 11
Decrement Thread count is 10
Increment Thread count is 11
Increment Thread count is 12
Decrement Thread count is 11
Increment Thread count is 12
Increment Thread count is 13
Increment Thread count is 14
Decrement Thread count is 13
Increment Thread count is 14
Increment Thread count is 15
Decrement Thread count is 14
Increment Thread count is 15
Increment Thread count is 16
Increment Thread count is 17
Decrement Thread count is 16
Increment Thread count is 17
Increment Thread count is 18
Decrement Thread count is 17
Increment Thread count is 18
Increment Thread count is 19
Increment Thread count is 20
Decrement Thread count is 19
Increment Thread count is 20
Increment Thread count is 21
Decrement Thread count is 20
Increment Thread count is 21
Increment Thread count is 22
Decrement Thread count is 21
Increment Thread count is 22
Increment Thread count is 23
Increment Thread count is 24
Decrement Thread count is 23
Increment Thread count is 24
Increment Thread count is 25
Decrement Thread count is 24
Increment Thread count is 25
Increment Thread count is 26
Increment Thread count is 27
Decrement Thread count is 26
Increment Thread count is 27
Increment Thread count is 28
Decrement Thread count is 27
Increment Thread count is 28
Increment Thread count is 29
Increment Thread count is 30
Decrement Thread count is 29
Increment Thread count is 30
Increment Thread count is 31
Decrement Thread count is 30
Increment Thread count is 31
Increment Thread count is 32
Increment Thread count is 33
Decrement Thread count is 32
Increment Thread count is 33
Increment Thread count is 34
Decrement Thread count is 33
Increment Thread count is 34
Increment Thread count is 35
Increment Thread count is 36
Decrement Thread count is 35
Increment Thread count is 36
Increment Thread count is 37
Decrement Thread count is 36
Increment Thread count is 37
Increment Thread count is 38
Increment Thread count is 39
Decrement Thread count is 38
Increment Thread count is 39
Increment Thread count is 40
Decrement Thread count is 39
Increment Thread count is 40
Increment Thread count is 41
Decrement Thread count is 40
Increment Thread count is 41
Increment Thread count is 42
Increment Thread count is 43
Decrement Thread count is 42
Increment Thread count is 43
Increment Thread count is 44
Decrement Thread count is 43
Increment Thread count is 44
Increment Thread count is 45
Increment Thread count is 46
Decrement Thread count is 45
Increment Thread count is 46
Increment Thread count is 47
Decrement Thread count is 46
Increment Thread count is 47
Increment Thread count is 48
Increment Thread count is 49
Decrement Thread count is 48
Increment Thread count is 49
Increment Thread count is 50
Decrement Thread count is 49
Increment Thread count is 50
Increment Thread count is 51
Increment Thread count is 52
Decrement Thread count is 51
Increment Thread count is 52
^CTerminate batch job (Y/N)? n