GC in .NET example

Program.cs

/*
This is an example of GC in C#, how it works, and how it does not work.
This is intended to end some debates how it handles things.
*/

// First of all, this is a common misconception: IDisposable.Dispose() DOESN'T dereference or collects the object in any way or form.
// Example:
    class Test : IDisposable
    {
        public void RunTest()
        {
            Console.WriteLine("I'm alive");
        }

        public void Dispose()
        {
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Test test = new Test();
            test.RunTest();
            test.Dispose();
            test.RunTest();
            Console.ReadKey();
        }
    }
    
/*
Result:
I'm alive
I'm alive
*/

// As you can see, nothing happened.
// Now, let's make some changes, and make a Timer inside the method, call Dispose, and then set object reference to null.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GCExample
{
    class Test : IDisposable
    {
        public Test()
        {
            System.Timers.Timer timer = new System.Timers.Timer();
            timer.Elapsed += Timer_Elapsed;
            timer.Interval += 1000;
            timer.Start();
        }

        private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            Console.WriteLine("I'm still alive");
        }
        
        public void Dispose()
        {
            Console.WriteLine("Called our IDisposable.Dispose.");
        }
    }
    class Program
    {
        static void Test()
        {
            Test test2 = new Test();
            test2.Dispose();
            test2 = null;
        }
        static void Main(string[] args)
        {
            Test();
            GC.Collect();
            Console.ReadKey();
        }
    }
}

    
/*
Result (same happens if you are using the 'using' keyword):
Started test.
Called our IDisposable.Dispose.
I'm still alive
I'm still alive
I'm still alive
I'm still alive
I'm still alive
...*/