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23 has much more information about authorization rules. With these details in place, you re ready to access the profile information using the Profile property of the current page. When you run your application, ASP.NET creates a new class to represent the profile by deriving from System.Web.Profile.ProfileBase, which wraps a collection of profile settings. ASP.NET adds a strongly typed property to this class for each profile property you ve defined in the web.config file. These strongly typed properties simply call the GetPropertyValue() and SetPropertyValue() methods of the ProfileBase base class to retrieve and set the corresponding profile values. For example, if you ve defined a string property named FirstName, you can set it in your page like this: Profile.FirstName = "..." Figure 24-2 presents a complete test page that allows the user to display the profile information for the current user or set new profile information.

Figure 23-29. The completed application Here are some key takeaways from this preceding example: The context remains allocated throughout the application. The call to context.Inventories executes SQL to fetch all rows from the Inventory table into memory. The context tracks dirty entities, so it knows what SQL to execute upon SaveChanges(). After SaveChanges(), the entities are considered clean again.

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The first time this page runs, no profile information is retrieved, and no database connection is used. However, if you click the Show Profile Data button, the profile information is retrieved and displayed on the page: Protected Sub cmdShow_Click(ByVal sender As Object, ByVal e As EventArgs) lbl.Text = "First Name: " & Profile.FirstName _ & "<br />" & "Last Name: " & Profile.LastName _ & "<br />" & "Date of Birth: " & Profile.DateOfBirth.ToString() End Sub At this point, an error will occur if the profile database is missing or the connection can t be opened. Otherwise, your page will run without a hitch, and you ll see the newly retrieved profile information. Technically, the complete profile is retrieved when your code accesses the Profile.FirstName property in the first line and is used for the subsequent code statements.

That wraps up this chapter s examination of the ADO.NET Entity Framework. While there is so much more to this programming model than this chapter can address, you should now have a solid understanding about what problems EF attempts to solve and how to work with the overall programming model. Be sure to consult the .NET Framework 4.0 SDK documentation for more details of this slick data programming API.

Profile properties behave like any other class member variable. That means if you read a profile value that hasn t been set, you ll get a default initialized value (like an empty string or the number 0).

Summary

This chapter wrapped up your formal investigation of database programming using ADO.NET by examining the role of the Entity Framework. EF allows you to program against a conceptual model that closely maps to your business domain. While you can reshape your entities in any way you choose, the EF runtime ensures that the changed data is mapped to the correct physical table data. You learned about the role of (and composition of) *.edmx files and how to generate them using the Visual Studio 2010 IDE. Along the way, you also learned how to map stored procedures to functions in your conceptual layer, how to apply LINQ queries to the object model, the role of Entity SQL, and how to consume fetched data at the lowest level using the EntityDataReader. You wrapped up this chapter with a simple example of binding entity classes to graphical user interfaces within the context of a Windows Forms application. You ll see other examples of binding entities to GUI applications when you examine Windows Presentation Foundation and ASP.NET.

If you click the Set Profile Data button, the profile information is set based on the current control values: Protected Sub cmdSet_Click(ByVal sender As Object, ByVal e As EventArgs) Profile.FirstName = txtFirst.Text Profile.LastName = txtLast.Text Profile.DateOfBirth = Calendar1.SelectedDate End Sub Now the profile information is committed to the database when the page request finishes. If you want to commit some or all of the information earlier (and possibly incur multiple database trips), just call the Profile.Save() method. As you can see, the profiles feature is unmatched for simplicity.

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