How to invoke events across User Controls in ASP.NET

I have programmed applications in ASP.NET from the very beginning. My favourite .NET language is C#, and I am a fan of Test Driven Design. I was an experienced VB6 coder before the .NET era. I have also done some Transacted SQL programming in Sql Server. Although I have made a career on Microsoft technology, I have browsed enough Java code to read it fluently, and I find Smalltalk and Ruby very interesting.
 
I live a few kilometers away from Oslo.
 
My email is thomas.eyde@gmail.com.