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The previous example uses integrated Windows authentication, which is the default security standard for new SQL Server installations. You can also use SQL Server authentication. In this case, you will explicitly place the user ID and password information in the connection string. However, SQL Server authentication is disabled by default in SQL Server 2000 and later versions, because it s not considered to be as secure. Here s the lowdown on both types of authentication: With SQL Server authentication, SQL Server maintains its own user account information in the database. It uses this information to determine whether you are allowed to access specific parts of a database. With integrated Windows authentication, SQL Server automatically uses the Windows account information for the currently logged-in process. In the database, it stores information about what database privileges each user should have.

The basic principle of data binding is this: you tell a control where to find your data and how you want it displayed, and the control handles the rest of the details Data binding in ASPNET is superficially similar to data binding in the world of desktop or client/server applications, but in truth, it s fundamentally different In those environments, data binding involves creating a direct connection between a data source and a control in an application window If the user changes a value in the onscreen control, the data in the linked database is modified automatically Similarly, if the database changes while the user is working with it (for example, another user commits a change), the display can be refreshed automatically This type of data binding isn t practical in the ASPNET world, because you can t effectively maintain a database connection over the Internet.

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Tip You can set what type of authentication your SQL Server uses using a tool such as SQL Server Management Studio. Just right-click your server in the tree, and select Properties. Choose the Security tab to change the type of authentication. You can choose either Windows Only (for the tightest security) or SQL Server and Windows, which allows both Windows authentication and SQL Server authentication. This option is also known as mixed-mode authentication.

to load the ajax.htm script is not the exact same as is set in the open() URL parameter. Even the difference between http://www.example.com and http://example.com will result in an access denied error, so take care to make sure they both match exactly.

This direct data binding also severely limits scalability and reduces flexibility In fact, data binding has acquired a bad reputation for exactly these reasons ASPNET data binding, on the other hand, has little in common with direct data binding ASPNET data binding works in one direction only Information moves from a data object into a control Then the data objects are thrown away, and the page is sent to the client If the user modifies the data in a databound control, your program can update the corresponding record in the database, but nothing happens automatically ASPNET data binding is much more flexible than old-style data binding Many of the most powerful data binding controls, such as the GridView and DetailsView, give you unprecedented control over the presentation of your data, allowing you to format it, change its layout, embed it in other ASP.

For Windows authentication to work, the currently logged-on Windows user must have the required authorization to access the SQL database. This isn t a problem while you test your websites, because Visual Studio launches your web applications using your user account. However, when you deploy your application to a web server running IIS, you might run into trouble. In this situation, all ASP.NET code is run by a more limited user account that might not have the rights to access the database. By default, that account is an automatically created account named ASPNET (for IIS 5.1), or the network service account (for later versions of IIS). You need to grant database access to this account, or your web pages will receive a security error whenever they try to connect to the database.

NET controls, and so on You ll learn about these features and ASPNET s rich data controls in 16..

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