Lock a single variable in multi threaded applications

Instead of locking the entire object using the lock() statement in C#, the following code uses the InterLocked Class to perform thread-safe write operation on a variable. Because the following example uses the shared variable, the new value for the variable is available in both the threads.

								
static int x = 100;
static void Main(string[] args)
{
    Thread t1 = new Thread(delegate() { UpdateValue(); });
    t1.Start();
    Thread t2 = new Thread(delegate() { UpdateValue(); });
    t2.Start();
}

static void UpdateValue()
{
    Console.WriteLine("Output:");

    // Value of x is set to 30 here
    if (Interlocked.Exchange(ref Sample.x, 30) == 0)
    {
        Console.WriteLine("{0} static value is {1}", Thread.CurrentThread.Name, x);
        // Variable x is released after setting the value
        Interlocked.Exchange(ref Sample.x, 0);
    }
    else
    {
        Console.WriteLine("{0} is denied access to the static value x", Thread.CurrentThread.Name);
    }
}