how to implement connection points with C#?

How can I implement a connection point with C#?

I have to use c # to achieve the process component, and now would like to achieve the connection point function. Can you help me?

Now i treat the C# com exe as a dll ,and add it as a reference.And use it like a dll.And use event to deal with my problem.It was so easy!

Now i use late binding to call the com ,but how can i use event or connection point?

Is it available?