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Because profiles are stored in a user-specific record, you need to authenticate the current user before you can read or write profile information. You can use any type of authentication system (Windows, forms, or custom). You simply need to add an authorization rule to prevent anonymous access for the page or folder where you plan to use the profile. Here s an example: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> ... <system.web> <authentication mode="Windows"/> <authorization> <deny users=" "/> </authorization> ... </system.web> </configuration> 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.

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 void cmdShow_Click(object sender, EventArgs e) { lbl.Text = "First Name: " + Profile.FirstName + "<br />" + "Last Name: " + Profile.LastName + "<br />" + "Date of Birth: " + Profile.DateOfBirth.ToString(); } 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.

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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).

If you click the Set Profile Data button, the profile information is set based on the current control values: protected void cmdSet_Click(object sender, EventArgs e) { Profile.FirstName = txtFirst.Text; Profile.LastName = txtLast.Text; Profile.DateOfBirth = Calendar1.SelectedDate; } 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.

The tools laid out in this chapter won t provide major new features for your applications, but they can help with many of the simpler tasks many applications need. These little things can really help tie it all together. How the application actually gets used is another issue, with some of the more interesting options described in the next chapter.

The Profile object doesn t include just the properties you ve defined. It also provides LastActivityDate and LastUpdatedDate properties with information drawn from the database.

Earlier, you learned how properties are serialized into a single string. For example, if you save a FirstName of Harriet and a LastName of Smythe, both values are crowded together in the PropertyValuesString field, saving space: HarrietSmythe The PropertyNames field gives the information you need to parse each value from the PropertyValuesString field. Here s what you ll see in the PropertyNames field in this example: FirstName:S:0:7:LastName:S:7:6: The colons (:) are used as delimiters. The basic format is as follows: PropertyName:StringOrBinarySerialization:StartingCharacterIndex:Length:

Something interesting happens if you create a profile with a DateTime data type. When you look at the PropertyValuesString field, you ll see something like this: < xml version="1.0" encoding="utf-16" ><dateTime>2005-07-12T00:00:00-04:00 </dateTime>HarrietSmythe Initially, it looks like the profile data is serialized as XML, but the PropertyValuesString clearly doesn t contain a valid XML document (because of the text at the end). What has actually happened is that the first piece of information, the DateTime, is serialized (by default) as XML. The following two profile properties are serialized as ordinary strings. The ProperyNames field makes it slightly clearer: DateOfBirth:S:0:87:FirstName:S:87:7:LastName:S:94:6: Interestingly, you have the ability to change the serialization format of any profile property by adding the serializeAs attribute to its declaration in the web.config file. Table 24-4 lists your choices. Table 24-4. Serialization Options

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