Madhur Maurya questions

• Error CS0246 The type or namespace name 'ErrorModel' could not be found (are you missing a using directive or an assembly reference?)
• Unable to fix error : This configuration section cannot be used at this path
• Create a playlist of test methods having same workitem id in Microsoft test explorer
• Unable to start process C:\Program Files\dotnet\dotnet.exe. The web server request failed with status code 502. Error in Visual Studio 2017

Madhur Maurya answers