This was my solution to the question. There is however one test case in the web browser IDE that is incorrect. In my solution I accounted for a string that can be given that is empty, which by definition is not an anagram. So a string "" being compared to any other string, including "" should be false as that is not an anagram.

public bool isAnagram(string s, string t)
{
    // using Regex to massage the strings and remove any special characters/white spaces
    var trimmedS = Regex.Replace(s, "[^a-zA-Z0-9]", "").ToLower();
    var trimmedT = Regex.Replace(t, "[^a-zA-Z0-9]", "").ToLower();
    // first checking the length of the words, if they are a different amount of charcters or they contain no characters they cannot be an anagram.
    if (trimmedS.Length != trimmedT.Length 
        || (trimmedS.Length <= 0|| trimmedT.Length <= 0))
    {
        return false;
    }

    // order the string alphabetically
    trimmedS = new string(trimmedS.OrderBy(c => c).ToArray());
    trimmedT = new string(trimmedT.OrderBy(c => c).ToArray());

    //if the strings match they are an anagram otherwise they are not.
    if (trimmedS == trimmedT)
    {
        return true;
    }
    else
    {
        return false;
    }
}