.NET Runtime
.NET: Microsoft Technologies based on the .NET software framework.Runtime: An environment required to run apps that aren't compiled to machine language.
1,135 questions
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L2S has been deprecated for many years now. I would not recommend you build code against it.
L2S is not supported on anything other than .NET Framework. The assemblies have not been ported to .NET Standard/Core/5. Since it is deprecated they won't be ported either.