Defining relationships

Now that we have built our main entity skeleton, we need to create some relationships between them. We want to be able to do stuff like retrieve a Quiz, then browse to their related Questions and get the available Answers. We'll also need to fetch the Result(s) for any given score, find out the ApplicationUser who made the quiz, and so on. To do this, we have to implement a set of entity-related properties that Entity Framework will load on demand using its default Lazy-Load retrieval feature.

The first thing we’ll do is add a new region to our Quiz class containing these three new properties:

#region Lazy-Load Properties
/// <summary>
/// The quiz author: it will be loaded
/// on first use thanks to the EF Lazy-Loading feature.
/// </summary>
[ForeignKey("UserId")]
public virtual ApplicationUser User { get; set; }

/// <summary>
/// A list containing all the questions related to this quiz. 
/// It will be populaed on first use thanks to the EF Lazy...