Testing bitwise stuff, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var res = 0;
            res = equalPairOfBits(0, 0);
            Console.WriteLine("Expected: {0}  Result: {1}", 1, res);
            
            res = equalPairOfBits(28, 27);
            Console.WriteLine("Expected: {0}  Result: {1}", 8, res);

res = equalPairOfBits(895, 928);
            Console.WriteLine("Expected: {0}  Result: {1}", 32, res);
        }
        public static int equalPairOfBits(int n, int m)
        {
            Console.WriteLine("Binary N: {0}", toBinary(n));
            Console.WriteLine("Binary M: {0}", toBinary(m));
            
            return ((n ^ m) & -(n^m)) ;
        }
        public static string toBinary(int x)
        {
            return Convert.ToString(x, 2);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 3