Make It Anagram - using C# List class, remove method - remove common char set, and then, left are ones to be deleted.

MakeItAnagram3.cs

using System;
using System.Collections.Generic;

namespace Solution
{
    static class Solution
    {
        static void Main()
        {
            string word1 = Console.ReadLine();
            if (word1 == null) return;

            string word2 = Console.ReadLine();
            if (word2 == null) return;

            List<char> chars1 = new List<char>(word1.ToCharArray());
            List<char> chars2 = new List<char>(word2.ToCharArray());

            for (int i = chars1.Count - 1; i >= 0; i--)
            {
                if (chars2.Remove(chars1[i]))
                {
                    chars1.RemoveAt(i);
                }
            }
            for (int i = chars2.Count - 1; i >= 0; i--)
            {
                if (chars1.Remove(chars2[i]))
                {
                    chars2.RemoveAt(i);
                }
            }
            Console.WriteLine(chars1.Count + chars2.Count);
        }
    }
}