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In both cases, the tool adds a little configuration entry to the application s web.config file. You can do this manually, just as you can enable the roles service. <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <roleManager enabled="true" /> <authentication mode="Forms" /> </system.web> </configuration> With this configuration in place, ASP.NET automatically creates a file-based database, ASPNETDB.MDF, in the application s App_Data directory, as already described in 21. If you want to use a custom store, you have to complete the following steps: 1. Create the data store either by using aspnet_regsql.exe or by executing the TSQL command scripts included in the .NET Framework directory. Both were introduced in 21. 2. Configure the roles provider to use the previously created custom store. You can configure the roles provider through the <roleManager> tag. You can either use a different database or use a completely different store if you want. In addition, you can configure certain properties through the <roleManager> tag that can t be configured in the WAT. <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <connectionStrings> <add name="MySqlStore" connectionString="data source=(local); Integrated Security=SSPI;initial catalog=MySqlDB"/> </connectionStrings>

Note If you attempt to use an object that does not implement IDisposable, you will receive a compiler error.

<system.web> <roleManager enabled="true" defaultProvider="MySqlProvider" cacheRolesInCookie="true" cookieName=".MyRolesCookie" cookieTimeout="30" cookieSlidingExpiration="true" cookieProtection="All"> <providers> <add name="MySqlProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="MySqlStore" applicationName="RolesDemo"/> </providers> </roleManager> <authentication mode="Forms"/> <compilation debug="true"/> </system.web> </configuration> As soon as you have added this configuration entry to your web.config file, you can select the provider through the WAT. Just switch to the Provider tab, and then click the link Select a Different Provider for Each Feature. Figure 23-3 shows the provider selection in the WAT.

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While this syntax does remove the need to manually wrap disposable objects within try/finally logic, the C# using keyword unfortunately now has a double meaning (importing namespaces and invoking a Dispose() method). Nevertheless, when you are working with .NET types that support the IDisposable interface, this syntactical construct will ensure that the object being used will automatically have its Dispose() method called once the using block has exited. Also, be aware that it is possible to declare multiple objects of the same type within a using scope. As you would expect, the compiler will inject code to call Dispose() on each declared object: static void Main(string[] args) { Console.WriteLine("***** Fun with Dispose *****\n"); // Use a comma-delimited list to declare multiple objects to dispose. using(MyResourceWrapper rw = new MyResourceWrapper(), rw2 = new MyResourceWrapper()) { // Use rw and rw2 objects. } }

Table 23-1 lists the properties you can configure through the <roleManager> configuration tag. Table 23-1. Options for the <roleManager> Configuration

At this point, we have seen two different approaches to constructing a class that cleans up internal unmanaged resources. On the one hand, you can override System.Object.Finalize(). Using this technique, you have the peace of mind that comes with knowing the object cleans itself up when garbage-collected (whenever that may be) without the need for user interaction. On the other hand, you can implement IDisposable to provide a way for the object user to clean up the object as soon as it is finished. However, if the caller forgets to call Dispose(), the unmanaged resources may be held in memory indefinitely.

This step is strongly discouraged. It s much better to configure multiple servers to use the same key, thereby removing any problem. 5 describes how to do this.

The Spring JDBC provides full access to the JDBC APIs. It simplifies the usage by providing different easy methods to execute queries and for working within the resultset. Moreover, Spring JDBC eliminates repetitive code and handles SQL errors properly. The acquisition and release of the connection, the execution of statements, and other redundant code that I wrote in the previous example are all handled by Spring. Here is just one example to show what the code looks like using Spring JDBC instead of the traditional one. public class UserDaoSpringJdbcImpl extends SimpleJdbcDaoSupport implements UserDao { public List<User> findAll() { String sql="SELECT * FROM users"; return getSimpleJdbcTemplate().query(sql, ParameterizedBeanPropertyRowMapper. newInstance (User.class)); } }

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