Sherlock And Anagram - C# define a new class with all functions - hashcode

SherlockAndAnagram11.cs

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

namespace SherlockAndAnagrams
{
    class CharCount
    {
        protected bool Equals(CharCount other)
        {
            return Equals(Array, other.Array);
        }

        public override int GetHashCode()
        {
            int hc = Array.Length;
            for (int i = 0; i < Array.Length; ++i)
            {
                hc = unchecked(hc * 13 + Array[i]);
            }
            return hc;
        }

        public readonly byte[] Array;

        public CharCount()
        {
            Array = new byte[26];
        }

        public CharCount(CharCount charCount)
        {
            Array = new byte[26];
            for (int i = 0; i < 26; i++)
            {
                Array[i] = charCount.Array[i];
            }
        }

        public void AddChar(char ch)
        {
            Array[ch - 'a']++;
        }

        public override bool Equals(object obj)
        {
            CharCount other = obj as CharCount;
            if (obj == null)
            {
                return false;
            }

            for (int i = 0; i < 26; i++)
            {
                int val = Array[i].CompareTo(other.Array[i]);
                if (val != 0)
                {
                    return false;
                }
            }

            return true;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            int t = int.Parse(Console.ReadLine());
            for (int i = 0; i < t; i++)
            {
                HandleTestCase();
            }
        }

        private static void HandleTestCase()
        {
            IDictionary<CharCount, int> dictionary = new Dictionary<CharCount, int>();
            string str = Console.ReadLine();

            for (int i = 0; i < str.Length; i++)
            {
                CharCount charCount = new CharCount();
                for (int j = i; j < str.Length; j++)
                {
                    charCount.AddChar(str[j]);
                    if (!dictionary.ContainsKey(charCount))
                    {
                        dictionary.Add(new CharCount(charCount), 1);
                    }
                    else
                    {
                        dictionary[charCount] = dictionary[charCount] + 1;
                    }
                }
            }

            Console.WriteLine(dictionary.Values.Sum(value => ((value * (value - 1)) / 2)));
        }
    }
}