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on whether the user has entered a user name that isn t recognized or a correct user name with the wrong password. This is usually not a good idea. If a malicious user is trying to guess a user name and password, the user s chances increase considerably if your application gives this sort of specific feedback.

System.out.println("Hello Filippo!"); for(Map.Entry<String, String> message : messages.entrySet()){ System.out.println(message); } } public void setMessages(Map<String, String> messages) { this.messages = messages; } } To inject a Map collection using the Spring configuration file is a bit different from List and Set as you have to specify both the key and the value: <bean id="helloFilippoForCollectionMapInjection" class="com.apress.flexjava.hellofilippo.HelloFilippoForCollectionMapInjection"> <property name="messages"> <map> <entry> <key> <value>Chris</value> </key> <value>How are you </value> </entry> <entry> <key> <value>Filippo</value> </key> <value>Fine thank you.</value> </entry> </map> </property> </bean> The result will be print key=value. Hello Filippo! Chris=How are you Filippo=Fine thank you. The last collection I find important and useful is Properties. It is similar to the Map collection except that Map can have values and keys of any type while the Properties collection supports just String types. Below are two examples of how to use the Properties collection in your Java classes and Spring configuration file. import java.util.Properties;

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Next, rename your namespace scope to AutoLotConnectedLayer and change the name of your initial class to InventoryDAL; this class will define various members to interact with the Inventory table of the AutoLot database Finally, import the following NET namespaces: using System; using SystemCollectionsGeneric; using SystemText; // You will use the SQL server // provider; however, it would also be // permissible to use the ADONET // factory pattern for greater flexibility using SystemData; using SystemDataSqlClient; namespace AutoLotConnectedLayer { public class InventoryDAL { } }.

Logging a user out of forms authentication is as simple as calling the FormsAuthentication.SignOut() method. You can create a logout button and add this code, as shown here: Protected Sub SignOutAction_Click(ByVal sender As Object, ByVal e As EventArgs) FormsAuthentication.SignOut() FormsAuthentication.RedirectToLoginPage() End Sub When you call the SignOut() method, you remove the authentication cookie. Depending on the application, you may want to redirect the user to another page when the user logs out. If the user requests another restricted page, the request will be redirected to the login page. You can also redirect to the login page immediately after calling the sign-out method. Or you can use the Response.Redirect method.

Note You might recall from 8 that when objects use types that manage raw resources (e.g., a database connection), it is a good practice to implement IDisposable and author a proper finalizer. In a production environment, classes such as InventoryDAL would do the same; however, you won t do that here, so you can stay focused on the particulars of ADO.NET.

In a sophisticated application, your login page might not actually be a page at all. Instead, it might be a separate portion of the page either a distinct HTML frame or a separately coded user control. Using these techniques, you can keep a login and logout control visible on every page. The membership API framework includes ready-to-use controls for providing this type of functionality.

The first task you must attend to is to define some methods that allow the caller to connect to and disconnect from the data source using a valid connection string. You will hard-code your AutoLotDAL.dll assembly to use of the types of System.Data.SqlClient, so you need to define a private member variable of SqlConnection that is allocated at the time the InventoryDAL object is created. Also, define a method named OpenConnection() and another named CloseConnection() to interact with this member variable: public class InventoryDAL { // This member will be used by all methods. private SqlConnection = null; public void OpenConnection(string connectionString) { sqlCn = new SqlConnection(); sqlCn.ConnectionString = connectionString; sqlCn.Open(); } public void CloseConnection() { sqlCn.Close(); } } For the sake of brevity, your InventoryDAL type will not test for possible exceptions, nor will it throw custom exceptions under various circumstances (e.g., a malformed connection string). If you were to build an industrial-strength data access library, you would absolutely want to use structured exception handling techniques to account for any runtime anomalies.

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