private void AddNewUserCommand() { if (Users.Contains(NewUser)) { OutputMessages.Add(new OutputMessage { Message = NewUser + " is already registered!", Level = "error" }); _loggerService.Write(this, NewUser + " is already registered!", "error"); } else { _loggerService.Write(this, "Add started", "debug"); _dbService.AddUser(NewUser); _loggerService.Write(this, NewUser + " added!", "debug"); OutputMessages.Add(new OutputMessage { Message = NewUser + " added!", Level = "" }); Users.Add(NewUser); } }