hamming distance, C#

Language: Layout:

//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)
        {
            public static class StringDistance
    {
        public static int GetHammingDistance(string s, string t)
        {
            if (s.Length != t.Length)
            {
                throw new Exception("Strings must be equal length");
            }

int distance =
                s.ToCharArray()
                .Zip(t.ToCharArray(), (c1, c2) => new { c1, c2 })
                .Count(m => m.c1 != m.c2);

return distance;
        }
    }
    class Program
    {
        static void Main()
        {
            Console.WriteLine(StringDistance.GetHammingDistance("climax", "volmax"));
            Console.WriteLine(StringDistance.GetHammingDistance("Ram", "Rom"));
            Console.WriteLine(StringDistance.GetHammingDistance("Mam", "Mom"));

}
    }
        }
    }
}

Show compiler warnings [ + ] Show input