Mats questions

• Some C# 9 features not available after upgrading Asp.Net Core 3.1 app to .Net 5
• Pattern for class instantiation from only one single place?
• Controlling access to an internal collection in c# - Pattern required
• Get .NET Core JsonSerializer to serialize private members
• How to safely identify a DSN (delivery status notification) message
• Protecting image media in an web application [closed]
• How to specify the exact location of an assembly in a config file
• Make a div fade away nicely after a given amount of time
• SQL Select: Update if exists, Insert if not - With date part comparison?
• Tasklist replacement for Visual Studio

Mats answers