Tips
Visual Studio 2013 のコードエディタの新機能 | troushoo
デバッガーのヒントとテクニック | Microsoft Learn [公式]
メソッドの返り値を知りたい
参考：
Visual Studio 2019 のデバッガーでメソッドの戻り値見たいんですが – Qiita
method return value doesn’t show up in Autos window while debugging – Visual Studio Feedback
$ReturnValue not found in VS 17.0.6 – Visual Studio Feedback
$ReturnValue in Watch window doesn’t work in VS2015 – Stack Overflow
Getting a method’s return value in the VS debugger – Stack Overflow
Can I find out the return value before returning while debugging in Visual Studio? – Stack Overflow