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and allows you to access it directly through the file without any additional configuration steps. The only prerequisite of course is that SQL Server 2005 is installed on the target machine. These database files are located in the special App_Data subdirectory of the application. When running ASP.NET with the default configuration, this file will be created automatically for you. But what causes the file to be created for you Well, the answer is quite simple: When a feature that requires a specific type of functionality is used for the first time, the provider automatically creates the database file with the necessary contents. Therefore, when you first run the security wizard you saw previously, the database will be created automatically when you create the first user. This functionality is provided by the SqlMembershipProvider class. (The actual implementation is also included in a utility class used by all SQL provider classes, such as like the SqlRoleProvider.)

In addition to the baked-in transactional support found within the .NET base class libraries, it is also possible to use the SQL language of your database management system. For example, you could author a stored procedure that uses the BEGIN TRANSACTION, ROLLBACK, and COMMIT statements.

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With the default configuration and SQL Server 2005 (Express Edition or the full version) installed, you don t have to prepare the data store and configure a membership provider, because the ASP .NET runtime uses the file-based SQL Server 2005 provider and automatically creates the database file for you. But if you want to use your own SQL Server database, or even your custom membership provider and store, you have to configure the provider as well as the connection string to the membership store database appropriately. For this purpose, you have to touch the web.config file directly or edit the configuration through the IIS MMC snap-in if you are running your application on IIS. In the case of using SQL Server storage (or other database-based storage), you have to configure the connection string as your first step. You can do this through the <connectionStrings /> section of the web.config file. For example, if you want to use a local database called MyDatabase where you have installed the database tables through the aspnet_regsql.exe tool as shown previously, you have to configure the connection string as follows (remember, the <connectionStrings /> section is located directly below the <configuration /> element): <connectionStrings> <add name="MyMembershipConnString" connectionString="data source=(local);Integrated Security=SSPI; initial catalog=MyDatabase" /> </connectionStrings> After you have configured the connection string for your custom membership storage, you must configure the membership provider for the application. For this purpose, you have to add the <membership /> section to your web.config file (if it s not already there) below the <system.web /> section, as follows: <system.web> <authentication mode="Forms" /> <authorization> <deny users=" "/> </authorization> <membership defaultProvider="MyMembershipProvider"> <providers> <add name="MyMembershipProvider" connectionStringName="MyMembershipConnString" applicationName="MyMembership"

While transactional-aware types exist throughout the base class libraries, you will focus on transaction objects found within an ADO.NET data provider, all of which derive from DBTransaction and implement the IDbTransaction interface. Recall from the beginning of this chapter that -IDbTransaction defines a handful of members:

enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="true" requiresUniqueEmail="true" passwordFormat="Hashed" type="System.Web.Security.SqlMembershipProvider" /> </providers> </membership> </system.web> Within the <membership /> section, you can add multiple providers as child elements of the <providers /> section. In the previous code, you can see a valid configuration for the included SqlMembershipProvider. It s important to not forget about the defaultProvider attribute. This attribute indicates the membership provider that will be used if you don t override the used provider in your code. Configured providers are shown in the ASP.NET web configuration when selecting the option Select a Different Provider for Each Feature, as shown in Figure 21-8.

public interface IDbTransaction : IDisposable { IDbConnection Connection { get; } IsolationLevel IsolationLevel { get; } void Commit(); void Rollback(); } Notice the Connection property, which returns a reference to the connection object that initiated the current transaction (as you ll see, you obtain a transaction object from a given connection object). You call the Commit() method when each of your database operations have succeeded. Doing this causes each of the pending changes to be persisted in the data store. Conversely, you can call the Rollback() method in the event of a runtime exception, which informs the DMBS to disregard any pending changes, leaving the original data intact.

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