Anagrams String, C#

Anagrams String

//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;
using System.Collections;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var word1= "hehehehehe";
            var word2 = "hhhhheeeeee";
                
            Console.Out.Write(IsAnagrams(word1, word2));   
        }
        
        public static bool IsAnagrams(string word1, string word2)
        {
            if (word1 == null || word2 == null)
            {
                return false;
            }
            if (word1.Length != word2.Length)
            {
                return false;
            }
            if (word1 == word2)
            {
                return true;
            }
            
            var word1Hash = BuildDict(word1);
            var word2Hash = BuildDict(word2);
             
            foreach (var pair1 in word1Hash)
            {
                var key = pair1.Key;
                if (word2Hash.ContainsKey(key))
                {
                    if (word2Hash[key] == pair1.Value)
                        return true;
                }
            }
            
            return false;
        }
        
        public static Dictionary<char, int> BuildDict(string word)
        {
            var hash = new Dictionary<char, int>();
            foreach (var c in word)
            {
                if (hash.ContainsKey(c))
                {
                    hash[c] +=1 ;
                }
                else
                {
                    hash[c] = 1 ;
                }
            }
            return hash;
        }
    }
    
}


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