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When using authorization rules in a subdirectory, ASP.NET still reads the authorization rules from the parent directory. The difference is that it applies the rules in the subdirectory first. This is important, because ASP .NET stops as soon as it matches an authorization rule. For example, consider an example in which the root virtual directory contains this rule: <allow users="dan" /> and a subdirectory contains this rule: <deny users="dan" /> In this case, the user dan will be able to access any resource in the root directory but no resources in the subdirectory. If you reverse these two rules, dan will be able to access resources in the subdirectory but not the root directory. To make life more interesting, ASP.NET allows an unlimited hierarchy of subdirectories and authorization rules. For example, it s quite possible to have a virtual directory with authorization rules, a subdirectory that defines additional rules, and then a subdirectory inside that subdirectory that applies even more rules. The easiest way to understand the authorization process in this case is to imagine all the rules as a single list, starting with the directory where the requested page is located. If all those rules are processed without a match, ASP .NET then begins reading the authorization rules in the parent directory, and then its parent directory, and so on, until it finds a match. If no authorization rules match, ASP .NET will ultimately match the <allow users="*"> rule in the machine.config file.

This chapter dove into the details of the disconnected layer of ADO.NET. As you have seen, the centerpiece of the disconnected layer is the DataSet. This type is an in-memory representation of any number of tables and any number of optional interrelationships, constraints, and expressions. The beauty of establishing relations on your local tables is that you can programmatically navigate between them while disconnected from the remote data store. You also examined the role of the data adapter type in this chapter. Using this type (and the related SelectCommand, InsertCommand, UpdateCommand, and DeleteCommand properties), the adapter can resolve changes in the DataSet with the original data store. You also learned how to navigate the object model of

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Generally, setting file access permissions by directory is the cleanest and easiest approach. However, you also have the option of restricting specific files by adding <location> tags to your web.config file. The location tags sit outside the main <system.web> tag and are nested directly in the base <configuration> tag, as shown here: <configuration> <system.web> <!-- Other settings omitted. --> <authorization> <allow users="*" /> </authorization> </system.web> <location path="SecuredPage.aspx"> <system.web> <authorization> <deny users=" " /> </authorization> </system.web> </location>

a DataSet using the brute-force manual approach, as well as with strongly typed objects, which the Dataset Designer tools of Visual Studio 2010 typically generate. You wrapped up by looking at one aspect of the LINQ technology set named LINQ to DataSet. This allows you to obtain a queryable copy of the DataSet, which can receive well formatted LINQ queries.

<location path="AnotherSecuredPage.aspx"> <system.web> <authorization> <deny users=" " /> </authorization> </system.web> </location> </configuration> In this example, all files in the application are allowed, except SecuredPage.aspx and AnotherSecuredPage.aspx, which have an access rule that denies anonymous users.

The previous two chapters examined the fundamental ADO.NET programming models the connected and disconnected layers, specifically. These approaches have enabled .NET programmers to work with relational data (in a relatively straightforward manner) since the initial release of the platform. However, Microsoft introduced a brand new component of the ADO.NET API called the Entity Framework (or simply, EF) in .NET 3.5 Service Pack 1. The overarching goal of EF is to allow you to interact with relational databases using an object model that maps directly to the business objects in your application. For example, rather than treating a batch of data as a collection of rows and columns, you can operate on a collection of strongly typed objects termed entities. These entities are also natively LINQ aware, and you can query against them using the same LINQ grammar you learned about in 13. The EF runtime engine translates your LINQ queries into proper SQL queries on your behalf. This chapter will introduce you to the EF programming model. You will learn about various bits of infrastructure, including object services, entity client, LINQ to Entities, and Entity SQL. You will also learn about the format of the all-important *.edmx file and its role in the Entity Framework API. Next, you will learn how to generate *.edmx files using Visual Studio 2010 and at the command line using the EDM generator utility (edmgen.exe). By the time you complete this chapter, you will have the final version of AutoLotDAL.dll, and you will learn how to bind entity objects to a Windows Forms desktop application.

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