Using finalizers

Program.cs

using System;

namespace _26_ManageObjLifecycle
{
    class Program
    {
        static void Main(string[] args)
        {
            var baseClassWithFinalizer = new BaseClassWithFinalizer();
            baseClassWithFinalizer = null; 
            // By setting it to null, you will allow the Finalizer for that object to be executed when WaitForPendingFinalizers is called.
            
            GC.Collect();
            GC.WaitForPendingFinalizers();

            Console.ReadKey();
        }
    }

    public class BaseClassWithFinalizer
    {
        private UnmanagedResource _unmanagedResource;

        public BaseClassWithFinalizer()
        {
            _unmanagedResource = new UnmanagedResource();
            _unmanagedResource.DoStuff();
        }

        ~BaseClassWithFinalizer()
        {
            Console.WriteLine("BaseClassWithFinalizer is being called.");

            _unmanagedResource.Free();
        }
    }

    public class UnmanagedResource
    {
        public void DoStuff()
        {
            Console.WriteLine("Doing unmanaged stuff. File access created.");
        }

        public void Free()
        {
            Console.WriteLine("Freeing Unmanaged Resource.");
        }
    }
}