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 then Blank Solution in the right-hand pane.
   
3. In the Name: text box, type Chapter2.Reflections as the name of the solution. Select a preferred location under the Location: drop-down list or click 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.Reflections. 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.Reflections.CalculatorLib and leave the Location: text box as it is:

1. Click OK.

1. Now, the Solution Explorer (press Ctrl + Alt + L to open) should look like this: 

1. Select Class1.cs in the project tree and press F2. 
2. Rename Class1.cs as Calculator.cs, also making sure that you have done the same to the class name itself:

      using System;

      namespace Chapter2.Reflections.CalculatorLib
      {
          public class Calculator
          {
          }
      }

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

1. In the code window, and in between the curly brackets of the Calculator class, write the following code: 

      public int Add(int number1, int number2)
      {
          return number1 + number2; 
      }

      public int Subtract(int number1, int number2)
      {
          return number1 - number2;
      }

1. Let's do a quick build by pressing Ctrl + Shift + B.