public bool AddUser(UserDTO user)
{
if (user == null)
{
throw new ArgumentNullException("user data is null");
}
else if (!IsUserCorrect(user))
{
throw new IncorrectDataException();
}
foreach (var userData in GetAllUsers())
{
if (user.Email == userData.Email && user.Nickname == userData.Nickname)
{
return(false);
}
}
return(usersDAL.AddUser(user));
}
