Troubleshooting “program does not contain a static 'Main' method” when it clearly does…?

Question

My MS Visual C# program was compiling and running just fine. I close MS Visual C# to go off and do other things in life.

I reopen it and (before doing anything else)

Answer 1

I had this error and solved by this solution.

--> Right click on the project

--> and select "Properties"

--> then set "Output Type" to "Class Library".