public object Convert(object value, Type targetType, object parameter, string language)
        {
            if (value.ToString() == string.Empty)
            {
                return(value);
            }
            else
            {
                User user = new User();

                UserDbRepository userDbRepository = new UserDbRepository(Singletons.Singleton_ConnectionValue.Instance.SQLiteConnection);

                user = userDbRepository.GetUserInDatabase((string)value);

                if (user == null)
                {
                    return("B.Danych ; Numer NIP: " + value.ToString() + " ");
                }
                else
                {
                    return(user.NameCompany);
                }
            }
        }