public bool IsUserNameValidForNonExistingUser(string userName, out string errorMessage)
{
if (string.IsNullOrEmpty(userName))
{
errorMessage = UserNameCanNotBeEmptyErrorMessage;
return(false);
}
if (userName.Length < 8)
{
errorMessage = UserNameHasToBeMinimum8CharactersErrorMessage;
return(false);
}
Regex regex = new Regex("^[a-zA-Z0-9]*$");
if (!regex.IsMatch(userName))
{
errorMessage = UserNameHasToAlphaNumericWithNoSpecialCharactersErrorMessage;
return(false);
}
if (!AccountGateway.IsUsernameCreatable(WorkingDirectory, userName))
{
errorMessage = UserNameProbablyExistsErrorMessage;
return(false);
}
errorMessage = string.Empty;
return(true);
}