How to reference .NET 4.0 assembly within .NET 3.5 projects

Question

I would like to do some Office Interop stuff using .NET 4.0, but developing the rest of my project using VS2008 and .NET3.5.

How can I now use the functionality from

Answer 1

I'm not so sure about this but I believe you can do it this way (Altough, maybe not recomendable but technically posible.)

Since Net Framework 4.0 uses a diferent CLR and it's posible to have both installed side by side... Maybe you can try to load your 4.0 assembly in the 4.0 CLR and your 2.0 app into the 2.0 and communicate between both through web services.

Again, I'm not sure if this is posible. It's just some idea.