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If you re using the SQL Server provider, you can retrieve some interesting statistics using the SqlConnection.RetrieveStatistics() method (new in .NET 2.0). RetrieveStatistics returns a hashtable with various low-level details that can help you analyze the performance of commands and the amount of work you ve performed. Connection statistics aren t often used in a deployed application, but they are useful for diagnosing performance during the testing and profiling stage. For example, they provide one tool that you can use to determine how various data access strategies perform (other tools include the SQL Server administrative utilities, such as the SQL Profiler and Query Analyzer). By default, connection statistics are disabled to improve performance. To use connection statistics, you need to set the SqlConnection.StatisticsEnabled property to true. This tells the SqlConnection class to collect information about every action it performs. At any point after, you can call the RetrieveStatistics() method to examine this information, or you can use ResetStatistics() to clear it out and start from scratch. Here s an example that displays the number of bytes received by the connection since you enabled statistics: IDictionary statistics = con.RetrieveStatistics(); lblBytes.Text = "Received bytes: " + statistics["BytesReceived"].ToString(); Statistics are provided in a loosely typed name/value collection. That means you need to know the specific name of a statistic in order to retrieve it. You can find the full list in the MSDN help, but here are a few of the most useful:

Cookie authentication is, on the surface, a fairly straightforward system. You might wonder why you shouldn t just implement it yourself using cookies or session variables. The answer is the same reason developers don t implement features in ASP .NET ranging from session state to the web control framework. Not only does ASP .NET save you the trouble, but it also provides an implementation that s secure, well tested, and extensible. Some of the advantages provided by ASP.NET s implementation of forms authentication include the following: The authentication cookie is secure. Forms authentication is a well-tested system. Forms authentication integrates with the .NET security classes.

Figure 21-1 shows the fundamental architecture of the membership API, which consists of providers, an API, and controls for creating appropriate user interfaces.

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For debugging ASP.NET web applications, Windows authentication needs to be enabled because Windows determines whether you are allowed to debug or not based on your Windows user rights.

The membership API is designed to work completely independently from its underlying data store. You, as the application developer, primarily work with the controls provided by ASP .NET as well as the Membership class. The Membership class provides you with a set of methods for programmatically accessing users and roles of the store. These methods work with a membership provider. This provider implements the access to the underlying data store. Table 21-1 describes the membership components. Table 21-1. The Membership API Components

Cookie authentication seems simple, but if it s not implemented correctly, you can be left with an insecure system. On their own, cookies are not a safe place to store sensitive information, because a malicious user can easily view and edit cookie data. If your authentication is based on unprotected cookies, attackers can easily compromise your system. By default, the forms authentication module encrypts its authentication information before placing it in a cookie. It also attaches a hash code and validates the cookies when they return to the server to verify that no changes have been made. The combination of these two processes makes these cookies very secure and saves you from needing to write your own security code. Most examples of homemade cookie authentication are far less secure.

Figure 19-5 shows how you can configure IP address restrictions with IIS. IP address restrictions provide you with a possibility of restricting access to the web server from machines specified in the list of granted machines. This makes sense if you want only a couple of well-known business partners to be able to access your web server.

The Membership class is the primary point of interaction with the membership API. It provides a couple of methods for managing users, validating users, and resetting user passwords. An exception is thrown if an error occurs when you try to create a user through the Membership class. Represents a single user stored in a membership API credential store. This object contains all information about this user and is returned through several methods of the Membership class such as GetUsers.

Forms authentication is an integral part of ASP.NET, so it has already been used in a number of web applications and websites. Because so many people use the same system, flaws are quickly discovered, publicized, and solved. As long as you keep up-to-date with patches, you have a high level of

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