public MAppointment(MLesson Lesson, MKind Kind, int ID, DateTime Date, string Note, bool IsDone)
{
this.Lesson = Lesson;
this.Kind = Kind;
this.ID = ID;
this.Date = Date;
this.Note = Note;
this.IsDone = IsDone;
}
public VMKind(MKind Kind)
{
this.Model = Kind;
}