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) ); // Save to disk. inventoryDoc.Save("SimpleInventory.xml"); } The output is more or less identical, sans the custom processing instruction for a hypothetical style sheet: < xml version="1.0" encoding="utf-8" > <Inventory> <!--Current Inventory of cars!--> <Car ID="1"> <Color>Green</Color> <Make>BMW</Make> <PetName>Stan</PetName> </Car> <Car ID="2"> <Color>Pink</Color> <Make>Yugo</Make> <PetName>Melvin</PetName> </Car> </Inventory>

So far, all the examples have assumed that the user is authenticated before any profile information is accessed or stored Usually, this is the case However, sometimes it s useful to create a temporary profile for a new, unknown user For example, most e-commerce websites allow new users to begin adding items to a shopping cart before registering If you want to provide this type of behavior and you choose to store shopping cart items in a profile, you ll need some way to uniquely identify anonymous users ASPNET provides an anonymous identification feature that fills this gap The basic idea is that the anonymous identification feature automatically generates a random identifier for any anonymous user This random identifier stores the profile information in the database, even though no user ID is available.

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So far you have been building XML documents using fixed hard coded constructor values. More commonly, you will need to generate XElements (or XDocuments) by reading data from arrays, ADO.NET objects, file data, or whatnot . One way to map in-memory data to a new XElement is by using a set of standard for loops to move data into the LINQ to XML object model. While this is certainly doable, it is more streamlined to embed a LINQ query within the construction of the XElement directly. Assume you have an anonymous array of anonymous classes (just to avoid the amount of code for this example; any array, List<T> or other container would do here). You could map this data into an XElement as so: static void MakeXElementFromArray() { // Create an anonymous array of anonymous types. var people = new[] { new { FirstName = "Mandy", Age = 32}, new { FirstName = "Andrew", Age = 40 }, new { FirstName = "Dave", Age = 41 }, new { FirstName = "Sara", Age = 31} }; XElement peopleDoc = new XElement("People",

from c in people select new XElement("Person", new XAttribute("Age", c.Age), new XElement("FirstName", c.FirstName)) ); Console.WriteLine(peopleDoc); } Here, the peopleDoc object defines the root <People> element with the results of a LINQ query. This LINQ query creates new XElements based on each item in the people array. If this embedded query is a bit hard on the eyes, you could break things down into explicit steps, like so: static void MakeXElementFromArray() { // Create an anonymous array of anonymous types. var people = new[] { new { FirstName = "Mandy", Age = 32}, new { FirstName = "Andrew", Age = 40 }, new { FirstName = "Dave", Age = 41 }, new { FirstName = "Sara", Age = 31} }; var arrayDataAsXElements = from c in people select new XElement("Person", new XAttribute("Age", c.Age), new XElement("FirstName", c.FirstName)); XElement peopleDoc = new XElement("People", arrayDataAsXElements); Console.WriteLine(peopleDoc); } Either way, the output is the same: <People> <Person Age="32"> <FirstName>Mandy</FirstName> </Person> <Person Age="40"> <FirstName>Andrew</FirstName> </Person> <Person Age="41"> <FirstName>Dave</FirstName> </Person> <Person Age="31"> <FirstName>Sara</FirstName> </Person> </People>

case, the entity Address has a reference to the entity User and vice versa, so the relationship is bidirectional.

The user ID is tracked on the client side using a cookie (or in the URL, if you ve enable cookieless mode) Once this cookie disappears (for example, if the anonymous user closes and reopens the browser), the anonymous session is lost and a new anonymous session is created Anonymous identification has the potential to leave a lot of abandoned profiles, which wastes space in the database For that reason, anonymous identification is disabled by default However, you can enable it using the <anonymousIdentification> element in the webconfig file, as shown here: <configuration xmlns="http://schemasmicrosoftcom/NetConfiguration/v20"> .. <systemweb> <anonymousIdentification enabled="True" /> .. </systemweb> </configuration> You also need to flag each profile property that will be retained for anonymous users by adding the allowAnonymous attribute and setting it to True This allows you to store just some basic information and restrict larger objects to authenticated users.

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