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Out of the box, the ADO.NET DataSet (and related types such as DataTable and DataView) do not have the necessary infrastructure to be a direct target for a LINQ query. For example, the following method (which uses types in the AutoLotDisconnectedLayer namespace) results in a compile-time error: static void LinqOverDataTable() { // Get a DataTable of data. InventoryDALDisLayer dal = new InventoryDALDisLayer( @"Data Source=(local)\SQLEXPRESS;" + "Initial Catalog=AutoLot;Integrated Security=True"); DataTable data = dal.GetAllInventory(); // Apply a LINQ query to the DataSet var moreData = from c in data where (int)c["CarID"] > 5 select c; } If you were to compile the LinqOverDataTable() method, the compiler would inform you that the DataTable type provides a query pattern implementation. Similar to the process of applying LINQ queries to objects that do not implement IEnumerable<T>, ADO.NET objects must be transformed into a compatible type. To understand how to do so requires examining the types of System.Data.DataSetExtensions.dll.

In this chapter, you learned how to use Windows authentication with ASP.NET to let IIS validate user identities. You also learned about the different types of authentication, how to retrieve user information, and how to impersonate users so your code runs under a different Windows account. In the next chapter, you ll learn about using advanced authorization rules that apply to Windows authentication and forms authentication.

The System.Data.DataSetExtensions.dll assembly, which is referenced by default in all Visual Studio 2010 projects, augments the System.Data namespace with a handful of new types (see Figure 22-27).

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o far, you ve seen how to confirm that users are who they say they are and how to retrieve information about those authenticated identities. This gives your application the basic ability to distinguish between different users, but it s only a starting point. To create a truly secure web application, you need to act upon that identity at various points using authorization. Authorization is the process of determining whether an authenticated user has sufficient permissions to perform a given action. This action could be requesting a web page, accessing a resource controlled by the operating system (such as a file or database), or performing an application-specific task (such as placing an order or assigning a project). Windows performs some of these checks automatically, and you can code others declaratively using the web.config file. You ll need to perform still others directly in your code using the IPrincipal object. In this chapter, you ll learn how ASP .NET authorization works, how to protect different resources, and how to implement your own role-based security.

Figure 22-27. The System.Data.DataSetExtensions.dll assembly The two most useful types by far are DataTableExtensions and DataRowExtensions. These classes extend the functionality of DataTable and DataRow by using a set of extension methods (see 12). The other key class is TypedTableBaseExtensions, which defines extension methods that you can apply to strongly typed DataSet objects to make the internal DataTable objects LINQ aware. All of the remaining members within the System.Data.DataSetExtensions.dll assembly are pure infrastructure, and they are not intended to be used directly in your code base.

The most straightforward way to set security permissions is on individual web pages, web services, and subdirectories. Ideally, a web application framework should support resource-specific authorization without requiring you to change code and recompile the application. ASP.NET supports this requirement with declarative authorization rules, which you can define in the web.config file. The rules you define are acted upon by the UrlAuthorizationModule, a specific HTTP module. This module examines these rules and checks each request to make sure users can t access resources you ve specifically restricted. This type of authorization is called URL authorization because it considers only two details the security context of the user and the URL of the resource that the user is attempting to access. If the page is forbidden and you re using forms authentication, the user will be redirected to the login page. If the page is forbidden and you re using Windows authentication, the user will receive an access denied (HTTP 401) error page, as shown in Figure 23-1, or a more generic error message or custom error page, depending on the <customErrors> element.

Now let s look at how you use the DataSet extensions. Assume you have a new C# Console Application named LinqToDataSetApp. Add a reference to the latest and greatest version (3.0.0.0) of the AutoLotDAL.dll assembly and update your initial code file with the following logic: using System; using System.Data; // Location of strongly typed data containers. using AutoLotDAL; // Location of strongly typed data adapters. using AutoLotDAL.AutoLotDataSetTableAdapters; namespace LinqToDataSetApp { class Program { static void Main(string[] args) { Console.WriteLine("***** LINQ over DataSet *****\n"); // Get a strongly typed DataTable containing the current Inventory // of the AutoLot database.

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