private void Dungeon_DragDrop(object sender, DragEventArgs e)
{
if (e.Data.GetData(typeof(Room)) != null)
{
Room room = (Room)e.Data.GetData(typeof(Room));
room.Dispose();
}
if (e.Data.GetData(typeof(Entrance)) != null)
{
Entrance entrance = (Entrance)e.Data.GetData(typeof(Entrance));
entrance.Dispose();
}
}