.net 3.5 to 4.0 Migration

Currently we are doing a payroll application in Microsoft Visual Studio 2008 (.Net 3.5) using some of the latest features like WCF, WF and the development for the same has almost completed.

However, clients have shown their interest in migrating the developed payroll application in Microsoft Visual Studio 2008 (.Net 3.5) to Microsoft Visual Studio 2010 (.Net 4.0).

I don't have an idea about the expected challen开发者_高级运维ges in the migration or if its just going to be very smooth.

Any thoughts or comments?

There should be no challenges. All of your 3.5 code will work as it had when built with VS 2008.

If you do a Google search you'll find many articles titled something like "What's new in 2010". You won't find things like "What's Different"

Except for this little tidbit From MSDN:

The .NET Framework 4 is highly compatible with applications that are built with earlier .NET Framework versions, except for some changes that were made to improve security, standards compliance, correctness, reliability, and performance.

The .NET Framework 4 does not automatically use its version of the common language runtime to run applications that are built with earlier versions of the .NET Framework. To run older applications with .NET Framework 4, you must compile your application with the target .NET Framework version specified in the properties for your project in Visual Studio, or you can specify the supported runtime with the Element in an application configuration file.

The see the article

Also:

If your application or component does not work after .NET Framework 4 is installed, please submit a bug on the Microsoft Connect Web site.

That tells me that 4.0 is meant to be perfectly backwards compatible, and if not, then it's something they need to fix.

If you're using IdeaBlade, expect a ruckus; other than that the transition for us was smooth as can be.

VS2010 did introduce a memory leak with the debugger and forces me to restart VS2010 about twice a day :/

The update to 4.0 with ninject was painless and quick.