public void UnRegister(Observer1 o)
{
if (!observer1s.Contains(o))
{
Console.WriteLine("Object does not exists in list");
}
else
{
observer1s.Remove(o);
}
}
public void Register(Observer1 o)
{
if (observer1s.Contains(o))
{
Console.WriteLine("Object already exists");
}
else
{
observer1s.Add(o);
}
}