Check Anagram

 public bool IsAnagram(string wordA, string wordB)

{

    if (wordA.Length != wordB.Length) return false;

    var dict = new Dictionary<char, int>();

    foreach (var c in wordA)

    {

        dict[c] = dict.GetValueOrDefault(c, 0) + 1;

    }

    foreach (var c in wordB)

    {

        if (!dict.ContainsKey(c)) return false;

        dict[c]--;

        if (dict[c] < 0) return false;

    }

    return true;

}