I would recommend learning .NET 3.5 since it is current and .NET 4.0 is still in beta. However if your book is .NET 2.0 then learn that (especially if it easier to learn from a book), most companies are slow to update anyway.
I learned .NET 2.0 in the first few years of college then .NET 3.5 in the final semester, there's not a big learning curve between the two.
~ Hope this helps
I learned .NET 2.0 in the first few years of college then .NET 3.5 in the final semester, there's not a big learning curve between the two.
~ Hope this helps