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Forms authentication stores users in the web.config file by default, but, as you will see in the section Custom Credentials Store, you can store the information anywhere you like. You just need to create the code that accesses the data store and retrieves the required information. (And if you use the Membership API introduced in 21, you even don t need to do that.) A common example is to store the user information in a custom database. This flexibility in the storage of user information also means you can control how user accounts are created and administered, and you can attach additional information to user accounts. By comparison, Windows authentication (discussed in 22) is much less flexible. It requires that you set up a Windows user account for each user you want to authenticate. This is obviously a problem if you want to serve a large number of users or if you want to register users programmatically. It also doesn t allow you to store additional information about users. (In the case of Active Directory, you have the possibility of extending the schema, but this is something that needs to be planned well.) Instead, you have to store this information separately. Passport authentication has similar limitations. Although Passport stores more user information, it doesn t allow you to add custom information, and it doesn t allow you to take part in user registration or account management.

Expires = DateTimeNowAddDays(10) Next, you have to add the cookie to the HTTP response: ResponseCookiesAdd(AuthCookie) Finally, you can redirect the user to the originally requested URL, which you can obtain by using the GetRedirectUrl() method: ResponseRedirect(FormsAuthenticationGetRedirectUrl( UsernameTextText, True)) The end result is a cookie that will persist beyond the closing of the browser but that will expire after ten days, at which point the user will need to reenter credentials to log into the website..

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SQL Server and Oracle connection pooling use a full-text match algorithm. That means any minor change in the connection string will thwart connection pooling, even if the change is simply to reverse the order of parameters or add an extra blank space at the end. For this reason, it s imperative that you don t hard-code the connection string in different web pages. Instead, you should store the connection string in one place preferably the <connectionStrings> section of the web.config file.

So far, you ve considered the reasons that make forms authentication an attractive choice for user authentication. However, forms authentication also has downsides: You have to create the user interface for users to log in. You have to maintain a catalog with user credentials. You have to take additional precautions against the interception of network traffic. The following sections explore these issues. You can solve the first two of these downsides by using the Membership API framework, which offers prebuilt controls and a prebuilt schema for credential storage and runs on SQL Server databases out of the box. You will learn about the Membership API framework in 21.

Summary

With both the SQL Server and Oracle providers, connection pooling is enabled and used automatically. However, you can also use connection string parameters to configure pool size settings. Table 7-2 describes these parameters. Table 7-2. Connection Pooling Settings

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