Redis, the popular in-memory data store, is switching away from the open source three-clause BSD license. Instead, in a move that is clearly aimed to prevent the large cloud providers from offering free alternatives to Redis’ own hosted services, Redis will now be dual-licensed under the Redis Source Available License (RSALv2) and Server Side Public License (SSPLv1). Under this new license, cloud service providers hosting Redis will need to enter into a commercial agreement with Redis. The first company to do so is Microsoft.

- Project format is changing to a single JSON file
- ASP.NET MVC and Web API have been unified into a single programming model
- Project Roslyn allows for a “no-compile” developer experience while making updates
- Migration to a OWIN hosting model allows for flexibility in production web hosts (IIS or running on Linux via Mono)

Installing Visual Studio 2019 16.4 will also install .NET Core 3.1 Preview 3, so you don’t need to separately install it. For Blazor development with .NET Core 3.1, Visual Studio 2019 16.4 is required. 

You can subclass  HandleErrorAttribute  and override its  OnException  member (no need to copy) so that it logs the exception with ELMAH and only if the base implementation handles it.  

There are several situations where you need to manage row level security for your database:

• Multi-tenancy (SaaS)
• Role or claim based row level security
• Logical delete
• Enabled/Disabled data 

.NET Aspire is a new framework from Microsoft for simplifying cloud-native development with .NET. It provides an opinionated stack and developer experience for building resilient, observable applications.  

The main change in this release is a security fix, and it’s possible you will need to change your own code to adapt. Here’s why: jQuery used a regex in its jQuery.htmlPrefilter method to ensure that all closing tags were XHTML-compliant when passed to methods. For example, this prefilter ensured that a call like jQuery("<div class='hot' />") is actually converted to jQuery("<div class='hot'></div>"). Recently, an issue was reported that demonstrated the regex could introduce a cross-site scripting (XSS) vulnerability. 

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