Programming Computers to Work Backwards from a Goal

 This is known as backward chaining. This technique is used by automated theorem provers and inference engines. It was used in the expert system Mycin, a famous AI case study.

Scope to View in Solution Explorer to Simplify and Focus

 If you want to focus on a specific file in Solution Explorer, you can right-click and select "Scope to View". To disengage, either click the Back button in Solution Explorer, or the Home icon.

Build does Not Support Previewing in WinForms in Visual Studio 2019 (MMDG Response)

This error can cause a form to disappear from the main viewport. The fix is to right-click and select "Move to Main Document Group".

Eliminating the Need For Escape Sequences with @

Prefixing a string with @ in .NET resolves the need for using backslash to denote an escape sequence. In other words it says: "interpret the string literally".

If you need to include speech marks in the @-prefixed string you can use double speech marks.

Where are we with .NET Core?

For .NET Core we are on version 3.1.9 (released October 13, 2020).

3.1.9 contains only non-security fixes.

VS Compatibility requirement is VS2019 16.4.

It is being deployed to Azure App Services with availability end October 2020.

ToolStrip Replaces ToolBar in Windows Forms

 This is true for .NET Core 3.1 and later versions.