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The client can use these names when it creates the proxy object to select the binding it wishes to use. Thus, if your client would like to use TCP, you could update the client side C# code as follows: static void Main(string[] args) { Console.WriteLine("***** Ask the Magic 8 Ball *****\n"); using (EightBallClient ball = new EightBallClient("NetTcpBinding_IEightBall")) { ... } Console.ReadLine(); } If a client would rather use the HTTP binding, you could write: using (EightBallClient ball = new EightBallClient("BasicHttpBinding_IEightBall")) { ... } That wraps up the current example, which showcased a number of WCF 4.0 s useful features. These features simplify how you can author hosting configuration files. Next up, you will see how to use the WCF Service Library Project template.

The destination page deserializes the query string passed in through the data query string parameter with the previously created class, as follows: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) ' Deserialize the encrypted query string Dim QueryString As New EncryptedQueryString(Request.QueryString("data")) ' Write information to the screen Dim Info As New StringBuilder() For Each key As String In QueryString.Keys Info.AppendFormat("{0} = {1}<br>", key, QueryString(key)) Next QueryStringLabel.Text = Info.ToString() End Sub This code adds the information to a label on the page. You can see the result of the previously posted information in Figure 25-10.

Source Code You can find the MagicEightBallServiceHTTPDefaultBindings project located under the 25 subdirectory.

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You need to do one more thing before you build a more exotic WCF service that communicates with the AutoLot database you created in 21. The next example will illustrate a number of important topics, including the benefits of the WCF Service Library project template, the WCF Test Client, the WCF configuration editor, hosting WCF services within a Windows service, and asynchronous client calls. To stay focused on these new concepts, this WCF service will be kept intentionally simple.

In this chapter, you learned how take control of the .NET security with advanced techniques. You saw how to use stream-based encryption to protect stored data and the query string. In the next chapter, you ll learn how to use powerful techniques to extend the ASP.NET security model.

Named queries allow your application to store its HQL queries in a mapping file and they enable the sharing of queries. Moreover, named queries let you use SQL, which allows you to keep all your SQL in one place. However, you can use just HSQL to keep the application more portable. To use named queries with annotations, Hibernate provides the @NamedQueries and @NamedQuery annotations. Before we see how to use named queries, let's think about why and where it would be logical to use them. For each entity, there are always some queries you need to reuse in different DAOs or methods, so it is better to store those queries within the entity itself using annotations, thus avoiding the need to rewrite the same query in the different DAOs or methods. For example, you might need to retrieve a user using the e-mail HQL query statement in other methods beside findByEmail, so it is better to move it to the entity itself. To do that, just open your User entity and add the following code under the @Table annotation: public static final String FIND_BY_EMAIL = "User.findByEmail"; @NamedQueries({ @NamedQuery(name=User.FIND_BY_EMAIL, query="from User u where u.email = :email") }) Now let's modify the UserDaoHibernateImpl findByEmail method body in order to use the new named query. The Hibernate session provides a method to get the named query, so to adapt the code to use the new named query, you just have to rename the method createQuery(HQL) to getNamedQuery(User.FIND_BY_EMAIL), as in the following example: public User findUserByEmail(String email){ Query query = getSession().getNamedQuery(User.FIND_BY_EMAIL); query.setString("email", email); return (User)query.uniqueResult(); } Using NamedQuery, you can access the User.FIND_BY_EMAIL named query from everywhere in your code and avoid constantly rewriting code every time you need to retrieve a user by email.

To begin, create a brand-new WCF Service Library project named MathServiceLibrary, making sure you select the correct option under the WCF node of the New Project dialog box (see Figure 25-2 if you need a nudge). Now change the name of the initial IService1.cs file to IBasicMath.cs. Once you do so, delete all of the example code within the MathServiceLibrary namespace and replace it with the following code:

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