A project with an Output type of Class Library cannot be started directly

Question

I've download sample code with C#. but when I run I get this error message:

A project with an Output type of Class Library cannot be started directly In order to debug this project, add an executable project to this solution which references the library project. Set the executable project as the startup project.

Please give me a solution.

Answer 1

The currently selected startup project is a Class Library.

You need an entry point for your application. Does your solution contain multiple projects?

Are you sure you want to 'run' the Class Library?

Possibly you've downloaded a Class Library solution only. In that case there might be unit tests that you can 'debug' to step-trough the code.

Update In response to your comment, these are possibilities to run the class library:

• Create a console application and reference the class library. Then 'use' its contents
• Debug an unit-test project
• start existing client project

Answer 2

If you have a project with an executable right-click this and select "Set as start project" - if not you have to write one to debug your code (or use Unit-Tests).