This question already has answers here:
Does C# 6.0 work for .NET 4.0?
(5 answers)
Closed 6 years ago.
The Null-conditional Operators has supposedly been introduced in C# 6.0 (or .NET Framework 4.6). However, my project uses the 4.5.2 version of the framework (C# 5.0). While I'm using Visual Studio 2015, the IDE seems to understand the new notation and compiles/works properly. However, I'm confused about whether the project would still work upon publish. My development machine has 4.6 installed but the production server might not.
In other words, is the Null-conditional Operators really compatible with 4.5.2 or am I missing something?
C# 6 works on the NET 4.5.1. You don't need .Net 4.6.
For more see Does C# 6.0 work for .NET 4.0?
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This question already has answers here:
Is .NET Core Runtime backwards compatible with previous releases?
(2 answers)
Closed 3 years ago.
Is it possible to run c# code compiled for .NET Core 2 at CoreCLR 3? If it is possible, will I have any benefits like better garbage collection, mentioned in the .NET Core 3 release announcement?
You will have to migrate the code to .Net Core 3. Microsoft provides migration documentation
https://learn.microsoft.com/en-us/aspnet/core/migration/22-to-30
Overall if your code is pretty basic there is likely not much for you to update.
This question already has answers here:
What's the difference between .NET Core, .NET Framework, and Xamarin?
(11 answers)
Closed 4 years ago.
I have navigate to https://www.microsoft.com/net/download/windows
to download .net core SDK , then i saw there is 3 build apps
.Net Core
Visual Studio
.NET Framework Develop Pack
Can anyone explain what is the difference between 1st one and 3rd one ?
The first is .NET Core which is a smaller subset of the .NET framework. .NET Core was largely for web apps and web workers, but it was announced yesterday that soon .NET Core will support desktop applications as well. Not all assemblies are available in Core, but it has a smaller package size and will run on any platform.
.NET Framework is the one people usually refer to when they say ".NET", which is the full-featured framework that is used to build VB.NET and C# applications.
A great read about the difference in use for server applications (which is where the real details lie) can be found here.
This question already has answers here:
How to use C# 7 with Visual Studio 2015?
(2 answers)
Closed 5 years ago.
I have installed .NET Framework 4.7 as well as the "Targeting Pack" available from Here. I then went and updated my the target framework to 4.7 on all my projects. Despite this, Visual Studio 2015 refuses to compile C# 7.0 syntax. Is there another step I am missing? OS is Windows 7 SP1.
To be able to use the new C# 7 language features, you need a C# compiler that understands these features.
VS.NET 2017 has a compiler that supports these features. The C# compiler incorporated in VS.NET 2015 does not.
This question already has an answer here:
Version Information on ASP.NET Server Error Page
(1 answer)
Closed 7 years ago.
I am implementing an MVC 5 website in C# (VS 2013 update 4) and the build setting is targeting .NET framework version 4.5. However when I load the page, I see the following header entry:
X-AspNet-Version:4.0.30319
Why is the website running under .NET 4.0xxxx despite the compile setting is pointing to .NET 4.5? Any ideas?
Thanks in advance.
That is not the actual .NET framework version. It is the version of the CLR.
From .NET 4 up to 4.5.2 it is version 4. Between 2.0 and 3.5 it was version 2.0.
That is also the reason that in your application pool configuration you can only choose .NET 2 or 4.
See MSDN: .NET Framework Versions and Dependencies on this matter.
https://stackoverflow.com/a/25632090/511418
This question already has answers here:
How do I change the .Net Framework from version 3.5 to version 4.0
(5 answers)
Closed 8 years ago.
I am working on a solution which contains multiple projects. it's working on .net version 4.5 and now my PM asked me to convert the solution to .net 4.5.1 and merge it back into the source code. can any one help me how to covert the my current solution into .net 4.5.1
Go into the properties window for each project and change the Target Framework to 4.5.1.