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Furthermore, it s important to include the PageIsValid condition at the beginning of this procedure The reason for this is that validation controls by default use JavaScript for client-side validation When calling PageValidate(), the validation takes place on the server This is important for browsers that either have JavaScript turned off or don t support it Therefore, if you don t include this part, validation will not happen if the browser doesn t support JavaScript or doesn t have JavaScript enabled So, you should always include server-side validation in your code The FormsAuthentication class provides two methods that are used in this example The Authenticate() method checks the specified user name and password against those stored in the webconfig file and returns a Boolean value indicating whether a match was found.

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The ExecuteReader() method extracts a data reader object that allows you to examine the results of a SQL Select statement using a forward-only, read-only flow of information. However, when you wish to submit SQL statements that result in the modification of a given table (or any other non-query SQL statement, such as creating tables or granting permissions), you call the ExecuteNonQuery() method of your command object. This single method performs inserts, updates, and deletes based on the format of your command text.

Note Technically speaking, a nonquery is a SQL statement that does not return a result set. Thus, Select statements are queries, while Insert, Update, and Delete statements are not. Given this, ExecuteNonQuery() returns an int that represents the number of rows affected, not a new set of records.

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Remember that the methods of FormsAuthentication are Shared, so you do not need to create an instance of FormsAuthentication to use them you simply access them through the name of the class If FormsAuthenticationAuthenticate(UsernameTextText, PasswordTextText) Then .. End If If a match is found for the supplied credentials, you can use the RedirectFromLoginPage() method, as shown here: FormsAuthenticationRedirectFromLoginPage(UsernameTextText, False) This method performs several tasks at once: 1 It creates an authentication ticket for the user 2 It encrypts the information from the authentication ticket 3 It creates a cookie to persist the encrypted ticket information 4 It adds the cookie to the HTTP response, sending it to the client 5 It redirects the user to the originally requested page (which is contained in the query string parameter of the login page request s URL).

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Next, you will learn how to modify an existing database using nothing more than a call to ExecuteNonQuery(); your next goal is to build a custom data access library that can encapsulate the process of operating upon the AutoLot database In a production-level environment, your ADONET logic will almost always be isolated to a NET *dll assembly for one simple reason: code reuse! The first examples of this chapter have not done, simply so you can keep focused on the task at hand; however, it would be a waste of time to author the same connection logic, the same data reading logic, and the same command logic for every application that needs to interact with the AutoLot database Isolating data access logic to a NET code library means that multiple applications using any sort of front end (eg.

The second parameter of RedirectFromLoginPage() indicates whether a persistent cookie should be created Persistent cookies are stored on the user s hard drive and can be reused for later visits Persistent cookies are described in the section Persistent Cookies in Forms Authentication later in this chapter Finally, if Authenticate() returns False, an error message is displayed on the page Feedback such as this is always useful However, make sure it doesn t compromise your security For example, it s all too common for developers to create login pages that provide separate error messages depending.

, console-based, desktop-based, and web based) can reference the library at hand in a language-independent manner Thus, if you author your data library using C#, other NET programmers can build a UI in the language of their choice (eg, VB or C++/CLI) In this chapter, your data library (AutoLotDALdll) will contain a single namespace (AutoLotConnectedLayer) that interacts with AutoLot using the connected types of ADONET In the next chapter, you will add a new namespace (AutoLotDisconnectionLayer) to this same *dll that contains types to communicate with AutoLot using the disconnected layer Multiple applications will take advantage of this library throughout the remainder of this book Begin by creating a new C# Class Library project named AutoLotDAL (short for AutoLot Data Access Layer) and renaming your initial C# code file to AutoLotConnDALcs.

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