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As you saw in the previous chapter, working with the connected layer allows you to interact with a database using the primary connection, command, and data reader objects. You can use this handful of classes to select, insert, update, and delete records to your heart s content (as well as invoke stored procedures or perform other data operations [e.g., DDL to create table and DCL to grant permissions]). However, you have seen only part of the ADO.NET story. Recall that you can use the ADO.NET object model in a disconnected manner.

Using the disconnected layer, it is possible to model relational data using an in-memory object model Far beyond simply modeling a tabular block of rows and columns, the types within SystemData allow you to represent table relationships, column constraints, primary keys, views, and other database primitives Once you model the data, you can apply filters, submit in-memory queries, and persist (or load) your data in XML and binary formats You can do all of this without ever making a literal connection to a DBMS (hence the term, disconnected layer) by loading data from a local XML file or manually building a DataSet in code You could use the disconnected types without ever connecting to a database, but you will typically still use connection and command objects In addition, you will leverage a specific object, the data adapter (which extends the abstract DbDataAdapter class), to fetch and update data.

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The Login control is a composite control that solves the most common task for forms authentication based applications displaying a user name and password textbox with a login button. Furthermore, if events are caught through custom event procedures, it automatically validates the user against the default membership provider. The login status is a simple control that validates the authentication state of the current session. If the user is not authenticated, it offers a login button that redirects to the configured login page. Otherwise, it displays a sign-out button for the possibility of logging off. This is really a powerful control that allows you to display different sets of controls for authenticated and unauthenticated users. Furthermore, it allows you to display different controls for users who are in different roles, as you will see in 23. This allows the user to retrieve the password if the user has provided an e-mail address during registration. It requests the user name from the user and then automatically displays a user interface that displays the password question and requests the appropriate answer from the user. If the answer is correct, it uses the membership API to send the password to the user. This control is a composite control that requests the old password from the user and lets the user enter a new password including the password confirmation. Includes a complete wizard that guides the user (or an administrator) through the creation process of a user.

public class Main { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext ("ApplicationForAnnotationsConfiguration.xml"); HelloFilippoForAnnotationsConfiguration helloFilippo = (HelloFilippoForAnnotationsConfiguration) context.getBean("helloFilippoForAnnotationsConfiguration"); helloFilippo.hello(); } } In the Main class, I have instantiated the context loading the new Application XML configuration file, and then I get the bean helloFilippoForAnnotationsConfiguration from the IoC container. As you can see, the annotation @Component has informed Spring to inject the component with the same name of the class in lowercase. If you want to give a different name, you can specify within the @Component annotation. @Component("myName") However, I suggest you keep the default name. Using annotations is helpful for most scenarios, but again you will need to use XML configuration as it is more readable by everybody, centralized, and more scalable. In the next section we are going to talk in more detail about the life cycle of a bean, so you will have the full picture.

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