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Unlike forms authentication, Windows authentication isn t built into ASP.NET. Instead, Windows authentication hands over responsibility of authentication to IIS. IIS asks the browser to authenticate itself by providing credentials that map to a Windows user account. If the user is successfully authenticated, IIS allows the web-page request and passes the user and role information onto ASP .NET so that your code can act on it in much the same way that it works with identity information in a forms authentication scenario. Figure 22-1 shows the end-to-end flow.

Now, assume you wish to update your graphical interface to allow the user to delete a row from the inmemory DataTable that is bound to the DataGridView. One approach is to call the Delete() method of the DataRow object that represents the row to terminate. In this case, you specify the index (or DataRow object) representing the row to remove. To allow the user to specify which row to delete, add a TextBox (named txtCarToRemove) and a Button control (named btnRemoveCar) to the current designer. Figure 22-7 shows one possible UI update (note this example wraps the two controls in a GroupBox control, illustrating how they are related).

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You would want to use Windows authentication for three main reasons: It involves little programming work on the developer s part. It allows you to use existing user logins. It allows you to use impersonation and Windows security. The first reason is quite simple using Windows authentication allows IIS and the client browser to take care of the authentication process so you don t need to create a login page, check a database, or write any custom code. Similarly, Windows already supports basic user account features such as password expiry, account lockout, and group membership. The second, and most important, reason for using Windows authentication is that it allows you to leverage existing Windows accounts. Typically, you use Windows authentication for applications where the users are part of the same local network or intranet as your web server. That means you can authenticate users with the same credentials they use to log into their computers. Best of all,

The following logic behind the new Button s Click event handler removes the user-specified row, based on the ID of a car, from your in-memory DataTable. The Select() method of the DataTable class allows you to specify a search criteria, which is modeled after normal SQL syntax. The return value is an array of DataRow objects that matches the search criteria: // Remove this row from the DataRowCollection. private void btnRemoveCar_Click (object sender, EventArgs e) { try { // Find the correct row to delete. DataRow[] rowToDelete = inventoryTable.Select( string.Format("ID={0}", int.Parse(txtCarToRemove.Text))); // Delete it! rowToDelete[0].Delete(); inventoryTable.AcceptChanges(); } catch (Exception ex) { MessageBox.Show(ex.Message); } } You should now be able to run your application and specify a car ID to delete from the DataTable. As you remove DataRow objects from the DataTable, you will notice that the grid s UI is updated immediately; this occurs because it is bound to the state of the DataTable object.

public List<User> getUsers(){ return userDao.findAll(); } public List<User> addUser(User user){ userDao.merge(user); return getUsers(); } public User updateUser(User user){ return (User)userDao.merge(user); }

depending on the settings you use and the network architecture, you may be able to provide invisible authentication that works without forcing a separate login step. Instead, the browser simply uses the logged-in identity of the current user. The third reason you might want to use Windows authentication is that it allows you to take advantage of existing Windows security settings. For example, you can control access to files by setting Windows file-access permissions. However, it s important to remember that these permissions don t take effect automatically. That s because by default your web application runs using a fixed account (typically ASPNET, as defined in the machine.config file). You can change this behavior by carefully using Windows authentication and impersonation, as described in the Impersonation and Delegation on Windows Server 2003 section of this chapter.

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