Valid Anagram in C#

using System;
using System.Collections.Generic;
using System.Linq;

class MainClass {
    static void Main() {
        Console.WriteLine("Enter first string:");
        string str1 = "super";

        Console.WriteLine("Enter second string:");
        string str2 = "repus";

        if (AreAnagrams(str1, str2))
            Console.WriteLine("The strings are anagrams.");
        else
            Console.WriteLine("The strings are NOT anagrams.");
    }
    
    static bool AreAnagrams(string str1, string str2)
    {
        if (str1.Length != str2.Length) return false;
        
        Dictionary<char, int> charCount = new Dictionary<char, int>();
        
        foreach (char ch in str1)
        {
            if (charCount.ContainsKey(ch))
            {
                charCount[ch]++;
            } else {
                charCount[ch] = 1;
            }
        }
        
        foreach (char ch in str2)
        {
            if (!charCount.ContainsKey(ch) || charCount[ch] == 0) return false;
            charCount[ch]--;
        }
        
        return true;
    }
}