Mutex

mutex.cs

public class Sample
{
  object mutex = new object();
  
  int counter;
  
  public void IncrementTwice()
  {
     lock (mutex)
     {
       counter = counter + 1;
       counter = counter + 1;
     }
  }
  
  public int Get()
  {
     // same as lock (lock is just a syntax sugar)
     Monitor.Enter(mutex);
     try
     {
       return counter;
     }
     finally
     {
        Monitor.Exit(mutex);
     }
  }
}