How to do it...

1. Open Visual Studio 2017.
2. Now open the solution from the previous recipe. Click File | Open | Open Project/Solution, or press Ctrl + Shift + O, and select the Chapter2.Primitives solution. 
3. Now click on the Chapter2.Library solution label. Click File | Add | New Project.
4. In the Add New Project template dialog box, expand the Visual C# node in the left-hand pane. 
5. Select Windows Classic Desktop and then Console App (.NET Framework) in the right-hand pane:

1. Now, in the Name: text box, type Chapter2.Primitives.PrimitivesConsole and leave the Location: text box as it is.

1. Click OK.
2. After adding the new project, the Solution Explorer (Ctrl + Alt + L) should look like this:

1. Click on the References label in the Chapter2.Primitives.PrimitivesConsole project node. Right-click and select Add | Add Reference.

1. In the Reference Manager, select Projects in the left-hand pane and check the Chapter2.Primitives.PrimitiveLib in the right-hand pane:

1. Click OK to add the reference to the selected project. 
2. Now, in the newly added console application project, double-click on Program.cs to open the code window.
3. Scroll up and add the following using directive:

      using Chapter2.Primitives.PrimitiveLib;

1. Now, scroll down and in between the curly braces of the Main() method, type the following code: 

      var myHelper = new Helpers();
      var myGrade = myHelper.WhatIsMyGrade(65);
      Console.WriteLine($"You are current grade is {myGrade}");

      Console.ReadLine();

1. Now press F5 to debug the code. 

1. You should see output like this: 

1. Now, press any key to exit the console, click just before the Console.ReadLine() line, and press Enter to add some new code. 
2. Let's type the following code now: 

      var cm = 15;
      var inches = myHelper.CmToInches(cm);
      Console.WriteLine($"{cm} centimeters in inches are {inches}");

1. Press F5 to see the output and you should see the following: 

1. Now that we have successfully tested the library, change some values and see how it works.