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First, using web.config as a credential store is possible for simple solutions with just a few users only. In larger scenarios, you should use the membership API, which is described in 21. Second, you can hash password values for credentials stored in the web.config file. Hashing is nothing more than applying one-way encryption to the password. This means the password will be encrypted in a way that it can t be decrypted any more. You will learn how you can hash passwords correctly when creating a custom membership provider in 26.

N ote The bean name in the <ref> attribute can be a reference to any bean injected into the container, even if

You use this method to begin a database transaction. You use this method to change the database on an open connection. This read-only property returns the amount of time to wait while establishing a connection before terminating and generating an error (the default value is 15 seconds). If you wish to change the default, specify a Connect Timeout segment in the connection string (e.g., Connect Timeout=30). This read-only property gets the name of the database maintained by the connection object. This read-only property gets the location of the database maintained by the connection object. This method returns a DataTable object that contains schema information from the data source. This read-only property gets the current state of the connection, which is represented by the ConnectionState enumeration.

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As mentioned earlier, you do not need to restrict access to pages in order to use authentication. It is possible to use authentication purely for personalization so that anonymous users view the same pages as authenticated users (but see slightly different, personalized content). However, to demonstrate the redirection functionality of forms authentication, it s useful to create an example that denies access to anonymous users. This will force ASP.NET to redirect anonymous users to the login page. 23 describes authorization in detail. For now, you ll use the simple technique of denying access to all unauthenticated users. To do this, you must use the <authorization> element of the web.config file to add a new authorization rule, as shown here: <configuration> <system.web> <!-- Other settings omitted. --> <authorization>

GetSchema()

<deny users=" " /> </authorization> </system.web> </configuration> The question mark ( ) is a wildcard character that matches all anonymous users. By including this rule in your web.config file, you specify that anonymous users are not allowed. Every user must be authenticated, and every user request will require the forms authentication ticket (which is a cookie). If you request a page in the application directory now, ASP.NET will detect that the request isn t authenticated and attempt to redirect the request to the login page (which will probably cause an error, unless you ve already created this page).

The properties of the DbConnection type are typically read-only in nature and are only useful when you wish to obtain the characteristics of a connection at runtime. When you wish to override default settings, you must alter the construction string itself. For example, the connection string sets the connection timeout setting from 15 seconds to 30 seconds:

Unlike the <authentication> element, the <authorization> element is not limited to the web.config file in the root of the web application. Instead, you can use it in any subdirectory, thereby allowing you to set different authorization settings for different groups of pages. You ll learn much more about authorization in 23.

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