Two String compare in C#

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

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            string a = "a" + 1;
            string b = "a" + 1;
            if (a.Equals(b))
            {
                Console.WriteLine("a.Equals(b)=true");
            }
            if (b.Equals(a))
            {
                Console.WriteLine("b.Equals(a)=true");
            }
            if (a == b)
            {
                Console.WriteLine("a==b=true");
            }
            if (string.Compare(a, b) == 0)
            {
                Console.WriteLine("string .Compare(a,b)==0");
            }
            if (string.CompareOrdinal(a, b) == 0)
            {
                Console.WriteLine("string.Campareoriginal(a,b)==0");

            }
        }
    }
}