[2008] winsock and feasibility

hi,

Just a couple of questions as I have just moved from Vb6 to Visual Studio 2008.

I'm doing VB.net as I am most familiar with it. I have two questions, firstly, is it feasible to use .NET 3.5. I mean is it necessary if I can acheive all aims with .net 2.0.

I am just thinking of compatiblity here. How can I change my app to 2.0 without redesigning it.

I'm really new to this so be simple.

Also, I want to make a program that runs on port 80 and returns the same page when it is requested for. This would be C:\alert.html. This is to redirect requests. (Winsock) I do not want to open a new connection each time.

Thank you.