using System;

​

public class Test

{

    public Test(string name)

    {

        Name = name;

    }

    public string Name;

}

​

public class Program

{

    public static void Main()

    {

        var test = new Test("Qwerty");

        var str = test.Name;        

        WeakReference testRef = new WeakReference(test);    

        Console.WriteLine(testRef.IsAlive);

        Console.WriteLine(str);

​

        test = null;

        GC.Collect();

        Console.WriteLine(testRef.IsAlive);

        Console.WriteLine(str);

    }

}