How to do it...

1. Open Visual Studio 2017.
2. Click File | New | Project and, in the New Project template dialog box, select Visual Studio Solutions under the Other Project Types node in the left-hand pane and select Blank Solution in the right-hand pane.
   
3. In the Name: text box, type Chapter2.Primitives as the name of the solution. Select a preferred location under the Location: drop-down list or click the Browse... button and select a location. Leave the defaults as they are.

1. Click OK. 
2. Now, in the Solution Explorer (or press Ctrl + Alt + L), select Chapter2.Primitives. Right-click and, select Add | New Project.
3. In the Add New Project dialog box, expand the Visual C# node and select .NET Standard in the left-hand pane. 

1. In the right-hand pane, select Class Library (.NET Standard):

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

1. Click OK.

1. Now, the Solution Explorer should look like this: 

1. Click on Class1.cs and press F2 to rename it. Type Helpers.cs as the new name. 
2. Select Yes in the confirmation dialog box for renaming. 
3. Now, double-click on Helpers.cs to open its code window. 
4. Type the following code in between the curly brackets of the Helpers class: 

      public char WhatIsMyGrade(int yourMarks)
      {
          var grade = 'F';
          if (yourMarks >= 85)
              grade = 'A';
          else if (yourMarks >= 65)
               grade = 'B';
          else if (yourMarks >= 55)
               grade = 'C';
          else if (yourMarks >= 35)
               grade = 'S';

          return grade;
      }

1. Press Ctrl + Shift + B to build your code. 
2. Again, type the following code next to the ending curly bracket from step 14:

      public double CmToInches(double cm)
      {
          var oneCmToInches = 0.393700787;
    
          return oneCmToInches * cm; 
      }

1. Let's build our code to check that everything is fine. Click Build | Build Solution or press Ctrl + Shift + B and the solution should build successfully. Let's test our class library in the next recipe. 
2. Click File | Save All, or press Ctrl + Shift + S, to save the solution and the class library project.