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The Membership API is a complete user management system. It helps you create, edit, and delete users, and it includes functionality for password recovery. You can use the API for programmatically performing all these management tasks, or you can use the ASP.NET web configuration tool for the graphical administration of your users. With this infrastructure you can save lots of time, as you don t have to create your own user administration application anymore because it already exists within the ASP.NET 2.0 framework. Furthermore, it includes functionality for validating a user name and password combination entered by the user. You will learn more details about the Membership API in 21.

If FormsAuthentication.Authenticate(UsernameText.Text, PasswordText.Text) Then ' Create the ticket, add the cookie to the response, ' and redirect to the originally requested page. FormsAuthentication.RedirectFromLoginPage(UsernameText.Text, False) Else ' User name and password are not correct LegendStatus.Text = "Invalid username or password!" End If End Sub

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Impersonation is the process of executing code in the context (or on behalf) of another user identity By default, all ASPNET code is executed using a fixed machine-specific account (typically ASPNET on IIS 5x or Network Service on IIS 60) To execute code using another identity, you can use the built-in impersonation capabilities of ASPNET You can use a predefined user account, or you can assume the user s identity, if the user has already been authenticated using a Windows account You might want to use impersonation for two reasons: To give each web application different permissions: In IIS 5, the default account that s specified in the machineconfig file is used for all web applications on the computer If you want to give different web applications different permissions, you can use impersonation to designate different Windows accounts for each application.

In many cases authorization is performed on groups of users called roles. One role can contain many users, and a user can be assigned to many roles. ASP.NET 2.0 includes a ready-to-use API that allows you to assign users to roles as needed. Again, you can do this programmatically through the Roles API or with the ASP.NET web configuration utility. In 23, you will learn about the details of using the Roles API in your applications.

The ExecuteScalar() method returns the value stored in the first field of the first row of a result set generated by the command s SELECT query. This method is usually used to execute a query that retrieves only a single field, perhaps calculated by a SQL aggregate function such as COUNT() or SUM(). The following procedure shows how you can get (and write on the page) the number of records in the Employees table with this approach: Dim con As New SqlConnection(connectionString) Dim sql As String = " SELECT COUNT(*) FROM Employees " Dim cmd As New SqlCommand(sql, con) ' Open the Connection, and get the COUNT(*) value. con.Open() Dim numEmployees As Integer = CInt(cmd.ExecuteScalar()) con.Close() ' Display the information. HtmlContent.Text &= "<br />Total employees: <b>" _ & numEmployees.ToString() & "</b><br />" The code is fairly straightforward, but it s worth noting that you must cast the returned value to the proper type because ExecuteScalar() returns an object.

That s especially important for hosting scenarios where you want to isolate web applications of different customers appropriately (so that, for example, a web application of customer A is not able to access directories or databases from a web application of customer B) To use existing Windows user permissions: For example, consider an application that retrieves information from various files that already have user-specific or group-specific permissions set Rather than code the authorization logic in your ASPNET application, you can use impersonation to assume the identity of the current user That way, Windows will perform the authorization for you, checking permissions as soon as you attempt to access a file These two scenarios are fundamentally different In the first scenario, impersonation defines a single, specific account.

Of course, if your web application authenticates users, these users may want to persist settings on your website for subsequent visits. Typically, for this use case you implement so-called user profiles that persist settings on a per-user basis between different visits of your website. The big difference between user profiles and session state is that profiles are persistent across multiple sessions. Again, ASP.NET 2.0 includes a ready-to-use infrastructure for managing profiles in your application. In 24, you will learn how you can use the Profiles API in your application.

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