validate a email

public static bool isEmail(string inputEmail)
        {
            inputEmail = NulltoString(inputEmail);
            string strRegex = @"^([a-zA-Z0-9_\\-\\.]+)@((\\[[0-9]{1,3}" +
            @"\\.[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\" +
            @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$";
            Regex re = new Regex(strRegex);
            if (re.IsMatch(inputEmail))
                return (true);
            else
                return (false);
        }