Password Validator

public class PasswordValidation
    {
        public static bool ValidatePassword(string password)
        {
            if (string.IsNullOrEmpty(password)) return false;
            return PasswordValidator.IsValidPassword(password.Trim());
        }
        public static class PasswordValidator
        {
            public static bool IsValidPassword(string password)
            {
                const int MIN_LENGTH = 8;
                const int MAX_LENGTH = 15;

                if (password == null) throw new ArgumentNullException();

                bool meetsLengthRequirements = password.Length >= MIN_LENGTH && password.Length <= MAX_LENGTH;
                bool hasUpperCaseLetter = false;
                bool hasLowerCaseLetter = false;
                bool hasDecimalDigit = false;
                bool hasSpecialChar = false;
                bool startedWithLetter = false;

                if (meetsLengthRequirements)
                {
                    bool firstchar = true;
                    foreach (char c in password)
                    {
                        if (firstchar)
                        {
                            startedWithLetter = char.IsLetter(c);
                            firstchar = false;
                        }
                        if (startedWithLetter)
                        {
                            if (char.IsUpper(c)) hasUpperCaseLetter = true;
                            else if (char.IsLower(c)) hasLowerCaseLetter = true;
                            else if (char.IsDigit(c)) hasDecimalDigit = true;
                            else if (!char.IsLetterOrDigit(c)) hasSpecialChar = true;
                        }
                    }
                }

                bool isValid = meetsLengthRequirements
                    && hasUpperCaseLetter
                    && hasLowerCaseLetter
                    && hasDecimalDigit
                    && startedWithLetter
                    && hasSpecialChar;
                return isValid;
            }
        }


    }

--------------------------------

To Use
----------------------------------

    else if (string.IsNullOrEmpty(Password))
            {
                UserDialogs.Instance.AlertAsync("The Field Cannot be Empty", "Alert", "Re-Try");
            }
            else if (!EmailValidator.ValidateEmailAddress(Password))
            {
                UserDialogs.Instance.AlertAsync("Invalid Pasword Format. Use a combination of upper case, lower case, numbers and special characters", "Alert", "Re-Try");
            }

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