c# - A project with an Output Type of Class Library cannot be started directly

Question

Please can someone could explain why I get this error and what to do to fix it (or what I'm doing wrong!). The steps I have taken are

1. Download Source code from http://www.codeproject.com/Articles/16859/AForge-NET-open-source-framework

2. Opening in VS2010 shows the references cannot be found

3. Re-Add all 3 references from PlayingCardRecognitioninRelease so no further warnings

4. When I try and build or Run I get the following message

Answer 1

To fix this issue, do these steps:

1. Right click the Project name in Solution Explorer of Visual Studio
2. Select Set as StartUp Project from the menu
3. Re-run your project It should work!

If it did not work, be sure that you have set your start page. If your project is C# Windows Application or C# Console Application, try this:

1. Right click the Project name in Solution Explorer of Visual Studio
2. Select Properties
3. Select the Application tab
4. In the Output Type drop box
5. Select the correct application type of your project
6. Re-run your project and let me know if it won’t work.