public int MatchCharCount(string data, string match)
{
    int returnValue = 0;
    char[] dataCharArray = data.ToCharArray();
    char[] matchCharArray = match.ToCharArray();
    for (int i = 0; i < matchCharArray.Length; i++)
    {
        for (int j = 0; j < dataCharArray.Length; j++)
        {
            if (matchCharArray[i] == dataCharArray[j])
            {
                returnValue++;
                break;
            }
        }
    }
    return returnValue;
}