I figured it out. It is actually the "VS 2008 Multi-Targeting Support" issue. Adding the C# Event Handler for WEB Page:
In .NET 2.0 or 3.5 if we use C#, we have to explicitly type the event handler method for the Page events. But if we use
VB.NET, we can select the object and event for the page events from Drop-Down controls in IDE same way we did in VS 2003.
Let's hope Microsoft will do something with this in SP1 or SP2...!
-Dmitriy