Here’s a summary of what’s new in this preview release:

• Improved startup debugging experience
• Blazor
  • Form model binding & validation with server-side rendering
  • Enhanced page navigation & form handling
  • Preserve existing DOM elements with streaming rendering
  • Specify component render mode at the call site
  • Interactive rendering with Blazor WebAssembly
  • Sections improvements
  • Cascade query string values to Blazor components
  • Blazor Web App template option for enabling server interactivity
  • Blazor template consolidation
• Metrics
  • Testing metrics in ASP.NET Core apps
  • New, improved, and renamed counters
• API authoring
  • Complex form binding support in minimal APIs
• Servers & middleware
  • HTTP.sys kernel response buffering
  • Redis-based output-cache
   

The biggest improvement in this release is support for C++/CLI (AKA “managed C++”). The changes for C++/CLI are primarily in Visual Studio. 

I wonder if Microsoft knew what it had on its hands back in in 2015 when it created Visual Studio Code, the little code editor that could.  

• Fixed known issue: The debugger's worker process (msvsmon.exe) unexpectedly exited. Debugging will be aborted.
• Fixed known issue: VS 2019 crashes when debugging async code.
• Fixed known issue: Xamarin problem following update to VS2019 16.1.
• Fixed known issue: [Xcode11] [Simulator] Updating to Xcode 11 stops the simulator from launching.
• Improved the reliability of Visual Studio by fixing an intermittent issue that happens when opening solutions.
• Fixed a crash with the search functionality in locals / autos / watch windows when the IDE is not in break mode. 

.NET Conf: Focus on Windows is a free, one-day livestream event that features speakers from the community and Microsoft teams working on Windows desktop apps and making them fantastic on the latest .NET 5. Learn why and how to upgrade WPF and Windows Forms apps to .NET 5, see Visual Studio tooling improvements, learn how to leverage cloud services from your client apps, and a whole lot more. You'll also see what the future of native device development with .NET will look like in .NET 6.  

JavaScript is a dynamically typed language which comes with great power of expression, but it also comes with almost no help from the compiler. For this reason we feel very strongly that any code written in JavaScript needs to come with a strong set of tests. We have built many features into Angular which make testing your Angular applications easy. With Angular, there is no excuse for not testing.