private void SignInButton_Click(object sender, RoutedEventArgs e) { var name = SignUpNameBox.Text; var phoneNum = SignUpPhoneBox.Text.Replace(" ", ""); var carPlateNum = SignUpCarPlateBox.Text.Replace(" ", ""); var login = SignUpLoginBox.Text.Replace(" ", ""); var password = SignUpPasswordBox.Password; if (name == "" || phoneNum == "" || carPlateNum == "" || login == "" || password == "") { MessageBox.Show("Fill in all the properties, please"); } else { var user = new User(); user.Name = name; user.Phone = phoneNum; user.Id = login; user.CarPlateNumber = carPlateNum; user.Password = password; if (_pm.FindUniqueData(user)) { _pm.EnterUser(user); } else { MessageBox.Show("You are already registered"); } } }