CaritasPWA/Shared/UserData.cs

using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace CaritasPWA.Shared {
    // The class that stores the user settings
    public class UserData : INotifyPropertyChanged {
        private string firstname;
        private string lastname;
        private string address;
        private string zip;
        private string city;
        private string phone;
        private string email;


        public string Firstname { get => firstname; set { firstname = value; RaisePropertyChanged(); } }
        public string Lastname { get => lastname; set { lastname = value; RaisePropertyChanged(); } }
        public string Email { get => email; set { email = value; RaisePropertyChanged(); } }
        public string Address { get => address; set { address = value; RaisePropertyChanged(); }}
        public string Zip { get => zip; set { zip = value; RaisePropertyChanged(); } }
        public string City { get => city; set { city = value; RaisePropertyChanged(); } }
        public string Phone { get => phone; set { phone = value; RaisePropertyChanged(); } }

        public event PropertyChangedEventHandler PropertyChanged;

        private void RaisePropertyChanged([CallerMemberName] string propertyName = null) {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}