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From a satellite view, JSF implements what is known as the Model 2 pattern, which is based on the MVC architecture. If you look at how the Model 2 pattern is applied in a JSF application, you can see it consists of three elements the view, the navigation model, and the application logic, as shown in Figure 1-3.

In this case, the Customer class was generated for me by the SQLMetal utility, as was the Northwind class for that matter After retrieving the customer, I updated one of the Customer object s properties, ContactName, and called the SubmitChanges method to persist the modified contact name to the database Please notice that I wrapped the call to the SubmitChanges method in a try/catch block and specifically caught the ChangeConflictException exception This is for handling concurrency conflicts, which I will cover in detail in 17 Before you can run this example or any of the others in this chapter, you will need to create entity classes for the Northwind database Please read the section in this chapter titled Prerequisites for Running the Examples to guide you through creation of the necessary entity classes.

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In addition to the following ways to delete attributes, be sure to check out the XElement.SetAttributeValue() section later in this chapter.

LINQ to SQL is a complex subject, and to provide any example requires involving many LINQ to SQL elements In the first example at the beginning of this chapter, I am utilizing a derived DataContext class, which is the Northwind class; an entity class, which is the Customer class; concurrency conflict detection and resolution; and database updates via the SubmitChanges method I can t possibly explain all these concepts simultaneously So, I need to give you some background on each of these components before I begin so that you will have a basic understanding of the foundation of LINQ to SQL Rest assured that I will cover each of these concepts in agonizing detail later in the subsequent LINQ to SQL chapters..

XAttribute.Remove()

Figure 1-3. MVC architecture with JSF (Model 2)

Just like the XNode class has a remove method, so too does the XAttribute class. Listing 7-81 is an example.

The DataContext is the class that establishes a connection to a database. It also provides several services that provide identity tracking, change tracking, and change processing. I ll cover each of these services in more detail in 16. For now, just know that it is the DataContext class that is connecting us to the database, monitoring what we have changed, and updating the database when we call its SubmitChanges method. It is typical with LINQ to SQL to use a class derived from the DataContext class. The name of the derived class typically is the same as the database it is mapped to. I will often refer to that derived class in the LINQ to SQL chapters as [Your]DataContext, because its name is dependent on the database for which it is being created. In my examples, my derived DataContext class will be named Northwind, because it was generated by the SQLMetal command-line tool, and SQLMetal names the generated, derived DataContext class after the database for which it is generated.

// we will use this to store a reference to one of the elements in the XML tree. XElement firstParticipant; XDocument xDocument = new XDocument( new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); Console.WriteLine(System.Environment.NewLine + "Before removing attribute:"); Console.WriteLine(xDocument); firstParticipant.Attribute("type").Remove(); Console.WriteLine(System.Environment.NewLine + "After removing attribute:"); Console.WriteLine(xDocument); As you can see, we use the Attribute method to obtain a reference to the attribute we want to remove, and then we call the Remove method on it. Just so you don t think we are just making this all up, here are the results:

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