NullCheck C# 5

gistfile1.cs

 class MainClass
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            var a = new A { };
            Console.WriteLine(string.Format("Result = [{0}]", a?.B?.Foo));
        }
    }

    public class A
    {
        public B B { get; set; }
    }

    public class B
    {
        public bool Foo { get; set; }
    }

Result = []