Blog entity

Create a Blog.cs class file and include the following properties:

    public class Blog
    {
      public int Id { get; set; }
      public string Url { get; set; }
      public ICollection<Post> Posts { get; set; }    
    }

The Entity Framework will look for any property with the name Id or TypeNameId and marks them as the primary key of the table. The Posts property is a navigation property which contains Post items related to this Blog entity. It doesn't matter whether we use ICollection<T> or IEnumerable<T> for the navigation property, EF will create a collection for us, HashSet<T> by default. We could also create a concrete collection using List<T>.