The referencesource repository contains sources from Microsoft .NET Reference Source that represent a subset of the .NET Framework. This subset contains similar functionality to the class libraries that are being developed in .NET Core. We intend to consult the referencesource repository as we develop .NET Core. It is also for the community to leverage to enable more scenarios for .NET developers. 

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.NET Tools are great, and we've known them for a while in .NET Core as ".NET Core Global Tools", but often we don't want these tools not to be shared globally across our machine. This is where "Local Tools" come in handy, introduced in .NET Core SDK 3.0. 

With the release of Visual Studio 2015 came the (final) release of the Roslyn C# compiler and C# 6. This latest version of C#’s feature list seems to be…less than exciting, but it’s important to keep in mind that before Roslyn, none of these new features would have ever made it into a release. It was simply too hard to add a feature in C#, so higher impact/value features made it in while minor annoyances/enhancements would be deferred, indefinitely 

This release arguably makes NHibernate the most advanced ORM in .NET functionality-wise. 

For .NET 6, we have made FileStream much faster and more reliable, thanks to an almost entire re-write. For same cases, the async implementation is now a few times faster! 

Starting in .NET 5.0, Roslyn analyzers are included with the .NET SDK. Roslyn analyzers are enabled, by default, for projects that target .NET 5.0 or later. You can enable them on projects that target earlier .NET versions by setting the EnableNETAnalyzers property to true. 

Unhandled exceptions are a bit of a misnomer. In .NET, every exception is handled. By the time you access the specifics of an error in your Try-Catch block, the Framework has already analyzed the problem, built a structure to contain its details, examined the stack trace, and used reflection to pinpoint the location of the error, among other mundane tasks. In short, when errors occur, .NET serves them up to your code in a neatly packaged, highly examinable data block.