C# - Simple Class Library and how to use it in another project

C# - Simple Class Library and how to use it

1. Create  a Class Library Project

2. Create a new project - Console Application

3. Right click on the newly created project and Set it as a StartUp Project

Reason: You cannot run a Class Library on it’s own, it needs to be called from another project.

4. Add a reference to your Class Library project

5. In the SimpleClassLibrary Project - rename the Class to PrintOK and add a public method WriteOK()

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.IO;

namespace SimpleClassLibrary

{

public class PrintOK

{

    public void WriteOK(){

     Console.WriteLine("OK");

     Console.ReadLine();

}

}

}

6. Add preprocessor  directive

7. In the UsingClassLibrary project, add the following code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using SimpleClassLibrary;

namespace UsingClassLibrary

{

class Program

{

   static void Main(string[] args)

    {

        PrintOK p = new PrintOK();

        p.WriteOK();

    }

}

}

8. Build the project and make sure the build succeeded:

9. Run the project

10. Success !

So, you’ve learned how to create and use a simple Class Library.