TwitterUser Class
The TwitterUser class contains various properties, such as the screen name of the Twitter user. It also includes a collection of TimelineItem objects that are maintained using an EntitySet. An EntitySet provides for deferred loading and manages the relationship of the collection side of one-to-many relationships between entities.
The TwitterUser constructor initializes the EntitySet, specifying two handlers: one that is called when a TimelineItem is added to its collection; the other when a TimelineItem is removed (see Listing 29.2).
The TwitterUser class also uses the Index attribute, which tells the DataContext to create a database index for the secondary column ScreenName.
Indexes improve the speed of data retrieval operations ...
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