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and password entered by the user were valid. The following example demonstrates this, and it assumes that you have written a function MyAuthenticate that connects to a SQL Server database and reads the corresponding user entry. It returns true if the entered user name and password match the ones stored in the database. protected void LoginAction_Click(object sender, EventArgs e) { Page.Validate(); if (!Page.IsValid) return; if (this.MyAuthenticate(UsernameText.Text, PasswordText.Text)) { FormsAuthentication.RedirectFromLoginPage(UsernameText.Text, false); } else { LegendStatus.Text = "Invalid username or password!"; } } Fortunately, ASP.NET 2.0 provides a ready-to-use infrastructure as well as a complete set of security-related controls that do this for you. The Membership API includes a SQL Server based data store for storing users and roles and functions for validating user names and passwords against users of this store without knowing any details about the underlying database, as you will learn in 21. Furthermore, this infrastructure is completely extensible through custom providers, as you will learn in 26.

While the loader can be called anything, the name Django uses for all of its template loaders is , so it s generally best to stick to that convention for ease of understanding. This is also typically placed in its own module, but again, the import path has to be supplied explicitly, so just make sure its location is well-documented. The first argument is obviously the name of the template to be loaded, which is usually just a standard filename. This doesn t have to map to an actual file, but views will typically request templates using a filename, so it s up to the template loader to convert this name to

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The examples you ve seen so far have used a nonpersistent authentication cookie to maintain the authentication ticket between requests. This means that if the user closes the browser, the cookie is immediately removed. This is a sensible step that ensures security. It s particularly important with shared computers to prevent another user from using a previous user s ticket. Nonpersistent cookies also make session hijacking attacks (where a malicious user gains access to the network and steals another user s cookie) more difficult and more limited. Despite the increased security risks of using persistent authentication cookies, it is appropriate to use them in certain situations. If you are performing authentication for personalization rather than for controlling access to restricted resources, you may decide that the usability advantages of not requiring users to log in on every visit outweigh the increased danger of unauthorized use. Once you have decided to use persistent cookies, implementing them is easy. You simply need to supply a value of true rather than false for the second parameter of the RedirectFromLoginPage() or SetAuthCookie() method of the FormsAuthentication class. Here s an example: FormsAuthentication.RedirectFromLoginPage(User nameTextBox.Text,true); By default, persistent cookies do not expire unless the FormsAuthentication.SignOut() method is used. Persistent cookies are not affected by the timeout attribute that is set in the <forms> element of the web.config file. If you want the persistent cookie to eventually expire sometime in the future, you have to use the GetAuthCookie() method of FormsAuthentication, set the expiry date and time, and then write the cookie to the HTTP response yourself. The following example rewrites the code that authenticates the user when the login button is clicked. It creates a persistent cookie but performs additional steps to limit the cookie s life span to ten days:

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