YOUserbase/User.cs

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

namespace YOUserbase {
    public class User : INotifyPropertyChanged {
        int id;
        string firstname;
        string lastname;
        DateTime birthDate;
        string details;
        Group workingGroup;
        bool isFullTime;
        bool isExternal;
        bool isRemote;
        int nbProjects;
        public int Id { get => id; set => ChangeValue(ref id, value); }
        public string Firstname { get => firstname; set => ChangeValue(ref firstname, value); }
        public string Lastname { get => lastname; set => ChangeValue(ref lastname, value); }
        public DateTime BirthDate { get => birthDate; set => ChangeValue(ref birthDate, value); }
        public string Details { get => details; set => ChangeValue(ref details, value); }
        public Group WorkingGroup { get => workingGroup; set => ChangeValue(ref workingGroup, value); }
        public bool IsFullTime { get => isFullTime; set => ChangeValue(ref isFullTime, value); }
        public bool IsExternal { get => isExternal; set => ChangeValue(ref isExternal, value); }
        public bool IsRemote { get => isRemote; set => ChangeValue(ref isRemote, value); }
        public int NbProjects { get => nbProjects; set => ChangeValue(ref nbProjects, value); }

        private static int index = 0;

        public User() {
            Id = ++index;
        }

        public User(int id) {
            Id = id;
        }

        // Wrpper to change vaulue and notify if it changed
        private void ChangeValue<T>(ref T field, T value, [CallerMemberName] string propertyName = "") {
            if(!value.Equals(field)) {
                field = value;
                if(PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }
}