public void EmptyDataBase() { Walls.RemoveRange(Walls); Windows.RemoveRange(Windows); WallBeams.RemoveRange(WallBeams); Doors.RemoveRange(Doors); DecorativeColumns.RemoveRange(DecorativeColumns); Architects.RemoveRange(Architects); Administrators.RemoveRange(Administrators); Clients.RemoveRange(Clients); Designers.RemoveRange(Designers); SaveChanges(); }