Fun with delegates

delegates.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FunWithDelegates
{
    class Program
    {
        delegate int SumDelegate(int a, int b);

        static void Main(string[] args)
        {

            SumDelegate t1 = new SumDelegate(Sum);

            SumDelegate t2 = delegate (int x, int y) { return x + y; };

            Func<int, int, int> t3 = delegate (int x, int y) { return x + y; };

            Func<int, int, int> t4 = (int x, int y) => x + y;

            var result = SumFuncDelegate(t1, 1, 2);

            var result2 = SumFunc(t4, 1, 2);

            var result3 = SumFunc((x, y) => x + y, 1, 2);

        }

        static int Sum(int a, int b)
        {
            return a + b;
        }

        static int SumFuncDelegate(SumDelegate func, int a, int b)
        {
            return func(a, b);
        }

        static int SumFunc(Func<int,int,int> func, int a, int b)
        {
            return func(a, b);
        }     
    }
}