Watch out the ToString() and ToString in the delegate.

DelegateFuction.cs

    public class Program
    {
        public static int StaticInt = 0;

        static Func<string> delegate1 = new Func<string>(StaticInt.ToString);

        static Func<string> delegate2 = new Func<string>(() => StaticInt.ToString());

        static void Main(string[] args)
        {
            StaticInt = 10;
            Console.WriteLine("StaticInt = {0}, StaticInt.ToString: {1}", StaticInt, delegate1());
            Console.WriteLine("StaticInt = {0}, () => StaticInt.ToString(): {1}", StaticInt, delegate2());
        }

    }