Writing entities and enums

Here are quick definitions of entity and enum before we start writing them in the domain project. What is an entity? An entity is a representation of a domain object model in an application. A database translates an entity into a row in a database table. Similarly, the properties of an entity are the columns in a database table.

On the other hand, an enum is a type of class representing a set of constants or read-only variables.

We have looked at a quick definition of an entity and an enum; now, let's see them in action.

Creating entities and enums for the Travel Tour application

In your solution application, go to the Travel.Domain project and create two directories:

• Entities
• Enums

The Entities directory will be for all the Travel Tour application entities, while the Enums directory is for all the Travel Tour application enums:

1. In the Entities folder, create a C# file, TourPackage.cs, and write this code:

   namespace...