How to Enable logging the application process stdout messages in Visual Studio 2019 when starting and debugging web application?

Trying to start web project - Debug - Start new instance - from Visual Studio 2019. It opens the browser at http://localhost:5221/ with the following error message HTTP Error 500.30 - ANCM In-Process Start Failure Instructions in the above page suggest the following: Common causes of this issue: The application failed to start The application started but then stopped The application started but threw an exception during startup Troubleshoot

I want to build different assemblies for my Windows Forms applications but I found what Win Forms application does not contains App.Debug.conf etc. For example in Web App I can click to "Add config transofm" and get new configuration file for current release configuration. How can I build applications with different release configurations(Debug, Release, etc.)?

Is there any way or tool to automatically calculate the total number of code lines in all source code files in a Visual Studio solution?