test.cs

internal class Program
{
	private static Test test;
	static void Main(string[] args)
	{
		Task.Run(() =>
		{
			while (true)
			{
				Test localTest = test;

				if (localTest != null && localTest.Ref == null)
				{
					
				}
			}
		});

		while (true)
		{
			test = null;
			test = new Test();
		}
	}

	class Test
	{
		public Test()
		{
			Ref = new object();
		}

		public object Ref { get; }
	}
}