I have a number of assemblies which were built with VS2005 (.Net 2.0). I would like to reference them in a VS2010 project. Do they need to be rebuilt in VS2010 to execute in the .Net 4.0 framework or will they continue to execute in the .Net 2.0 Framework?
Your .NET 2.0 assemblies will continue to work fine when referenced from a .NET 4.0 project in Visual Studio 2010.
This assumes that you have both .NET 2.0 and .NET 4.0 frameworks installed on the machines where your application will run. (.NET 4.0 framework is brand new from the "ground up" whereas the like of .NET 3.0 and 3.5 were "additive").
By default, your pre-built assemblies will continue to reference the .NET 2.0 framework (i.e mscorlib.dll etc.) whilst your new Visual Studio 2010 will reference the .NET 4.0 framework versions. See the screen-grab from reflector below:
(VS2005Test is a class library built against .NET 2.0 in VS2005, and TestReferencingVS2005.exe is a console application built against .NET 4.0 in Visual Studio 2010)
Visual Studio 2010 also supports "multi-targeting" with projects at the source code level. This means that you can load the source for a project that was written in VS 2005 and targets the .NET 2.0 framework, and VS2010 will allow that project to continue to target the 2.0 framework. Of course, you can also upgrade it to use 4.0.
So, if you don't mind re-building, and it's not going to cause you problems, you can use Visual Studio 2010 have both your assemblies and final application all targeting .NET 2.0 or "upgrade" the assemblies to .NET 4.0 along with your application.
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I have developed an outlook VSTO addin using VS 2008, supporting .net 3.5 . Now, I want to upgrade the .net framework version supported by my application to the latest .net 4.6.1 version. So, will I have to get Visual Studio 2015 for that, or any prior version will suffice?
you can target 4.6.1 .net framework with visual studio 2012 or later. You must install.NET Framework 4.6.1 Dev Pack.
https://www.microsoft.com/fr-fr/download/details.aspx?id=49978
Source :
https://msdn.microsoft.com/en-us/library/ms171868(v=vs.110).aspx
I have installed Visual Studio 2012 Express, and .NET Framework 4.5 got installed together.
Now from Visual Studio 2012, also if I target .NET 4.0 (Properties->Application->Target Framework), that doesn't seem to work. (The same happens from Visual Studio 2010, which by the way cannot target 4.5 at all!).
What I have noticed is that if I debug my project, and set a Watch on a SqlConnection variable, I see all the new 4.5 member properties (for example I see SqlConnection.ClientConnectionId property, introduced with .NET 4.5).
So, what is Visual Studio -> Properties -> Application -> Target Framework -> 4.0 supposed to do?
This 'strange' behaviour looks, in fact, perfectly normal when you realize that the installation of .NET Framework 4.5 is a replacement of .NET 4.0.
Look at Stack Overflow answer Can a build server with .NET 4.5 installed successfully deploy a project targeting 4.0 to a server with only .NET 4.0 installed?.
I am working with a project which uses .Net Frame V1.1 runs on VisualStudio 2003,
Now, I want to run my project in VisualStudio 2010?
Can I still target .NET Framework 1.1 in VisualStudio 2010?
Visual Studio 2010 only supports the 2.0, 3.0, 3.5, and 4.0 frameworks as targets. It does not support 1.1.
Is there any reason why you can't upgrade it to .NET 2.0. Did you know that .NET 1.1 is no longer officially supported on Server 2008 R2 and so I wouldn't expect it to be officially supported on any newer operating system.
I have read of some hacks to build .NET 1.1 projects for VS2005 and VS2008 - see below. Realize that if you set this up, then everyone else who works on the project will have to go through the same setup.
http://www.hanselman.com/blog/BuildingNET11ProjectsUsingVisualStudio2005.aspx
http://devlicio.us/blogs/ziemowit_skowronski/archive/2008/08/22/working-with-net-1-1-in-visual-studio-2008-and-team-server.aspx
No, .NET Framework 1.1 is not supported by Visual Studio 2010.
I know it's a bit close to
Can I use .NET 4.0 beta in Visual Studio 2008?
But my question is a bit different. I have a project that now uses .NET 4.0 (target .NET Framework 4.0) in Visual Studio 2010. Is it possible to use the project compiled dlls in Visual Studio 2008? How?
I don't want to use .NET4.0 directly in Visual Studio 2008, only the compiled dlls with target .NET Framework 4.0 (this is how my question is different that what has been asked so far).
I know that I was able to use .NET3.5 in Visual Studio 2005. So why not .NET4.0 in Visual Studio 2008?
.NET 3.5 didn't have new versions of mscorlib, System.dll etc - it had new assemblies, but the ones you could use from .NET 2 were the same.
.NET 4 introduces new versions of these core assemblies - and your built DLL will reference those new versions explicitly. Visual Studio 2008 doesn't know about those versions - or the CLR which goes with them.
If you want to use a library in Visual Studio 2008, you should target .NET 3.5 to start with.
I'm pretty aware that Visual Studio 2010 works with C# 4.0. But now I was wandering if I'm able to test C# 4.0 features with Visual Studio 2008.
I did that one time, using C# 3.0 with Visual Studio 2005 hacking the app.config file.
Did anyone have any success using C# 4.0 in VS2008?
I've installed Net Framework 4.0 beta, rebooted, created a new WPF application, chosen Application properties, but the Target Framework can be set only to Net Framework 3.5.
No. You can't use .NET 4.0 with VS2008, and you can't use the C# 4.0 features either - it's exactly the same situation as trying to make VS2005 cope with C# 3.0. The editor, Intellisense etc just don't know about the new features.
One important aspect is that even though it looks like Visual Studio is just using the external csc.exe compiler, it isn't - there's another "in-process" one. That in-process compiler is tied to the version of Visual Studio it comes with, so it only knows about the language features which were available at the time.
The 3.0 and 3.5 .NET libraries were just add-ons to 2.0. So it ws possible to test work done in VS 2008 using VS 2005 if you didn't use any 3.0 or 3.5 features.
My understanding is that the 4.0 is entirely new libraries, so I doubt you will be able to load or use them in VS 2008/2005.