Stupid C# anonymous objects tricks

anonymous_method.cs

            // First declare the "type" of Contact
            var Contact = new
            {
                First = (string)null,
                Last = (string)null,
                FullName = (Func<string>)null,
            };
            // Then, assign a closure over Contact to FullName to implement the "method"
            Contact = new
            {
                First = "Jacob",
                Last = "Krall",
                FullName = (Func<string>)(() => Contact.First + " " + Contact.Last)
            };
            Console.WriteLine(Contact.FullName()); // "Jacob Krall"

(From http://stackoverflow.com/questions/24770648/can-we-add-a-method-to-an-anonymous-type-that-refers-to-the-anonymous-types-mem)