Basic difference between .net 3.5 and 4.0

Question

Please tell me the basic difference between dotnet 2008 and 2010(3.5 and 4.0)

Answer 1

MSDN has a number of "What's New" pages up, including:

• "What's New in Visual Studio 2010"
• "What's New in the .NET Framework 4"

Answer 2

Uh, where to start. Here is what I love:

• all new things about parallel computing
• "dynamic" keyword and Dynamic Language Routine
• code contracts
• new background garbage collector
• compiling only necessary parts of Primary Interop Assemblies into your application, and compatibility/versioning improvements that this infrastructure allows for pure .NET code
• new stuff about exception handling (look for corrupted state exceptions)
• small stuff like BigInteger and SortedSet classes
• memory-mapped files handling in managed code

and may others, look around on the net, there is a lot of information already.

Answer 3

I hope I'm not incorrectly reading jignesh's question, but I would have to assume that the linking of a ton of "What's New" pages is probably not what they wanted. I would think that they could have done a search and pulled up that much.

I think what they are looking for is more of a feel for what people can break down for them as a reason to or not to go with a particular version - personal experience, not press releases.

For me, I'd say the biggest things for me that make 2010/4.0 worth the trip are the changes that allow me to distribute a client application without needing the dnFx installed on a machine, the new GC, the crazy-cool "dynamic", and (sadly, yes) the multi-monitor support.

Answer 4

A simple google brings up...

http://blogs.msdn.com/bclteam/archive/2009/05/22/what-s-new-in-the-bcl-in-net-4-beta-1-justin-van-patten.aspx

There are probably a lot more things, the Framework is massive so changes which are interesting for person x might not be as important for person y.

Answer 5

built in MVC in visual studio 2010 !!!

Answer 6

In that case (lance may) I must say that my favorites are the dynamic also and the super great solution to multi-threading - the Parallel lib, its really awesome and fast! (nested parallels are not always faster BTW)

But I feel that @jignesh asked if there's a real difference in the engineering structure, how it works from behind, something someone from inside should say, after all decided that it's different enough that if you want 3.5 and 4 in the same machine you need to install them both.

Anyway I would love an answer to that if there is :)

Answer 7

Difference between Framework 3.5 and Framework 4.0:

1. EnableViewState - [true or false] in Framework 3.5

   EnableViewState -[Enabled/Disabled/Inherits] in Framework 4.0

2. Keyword and Description is added in Framework 4.0 while it is not available in Framework 3.5 in the Page Directives.