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Expires = DateTimeNowAddDays(10) Next, you have to add the cookie to the HTTP response: ResponseCookiesAdd(AuthCookie) Finally, you can redirect the user to the originally requested URL, which you can obtain by using the GetRedirectUrl() method: ResponseRedirect(FormsAuthenticationGetRedirectUrl( UsernameTextText, True)) The end result is a cookie that will persist beyond the closing of the browser but that will expire after ten days, at which point the user will need to reenter credentials to log into the website..

class Program { static void Main(string[] args) { } } } Given this, update the Main() method of your Program class with the following code statements: class Program { static void Main(string[] args) { // Display a simple message to the user. Console.WriteLine("***** My First C# App *****"); Console.WriteLine("Hello World!"); Console.WriteLine(); // Wait for Enter key to be pressed before shutting down. Console.ReadLine(); } } Here we have a definition for a class type that supports a single method named Main(). By default, Visual Studio 2010 names the class defining Main() Program; however, you are free to change this if you so choose. Every executable C# application (console program, Windows desktop program, or Windows service) must contain a class defining a Main() method, which is used to signify the entry point of the application. Formally speaking, the class that defines the Main() method is termed the application object. While it is possible for a single executable application to have more than one application object (which can be useful when performing unit tests), you must inform the compiler which Main() method should be used as the entry point via the /main option of the command-line compiler, or via the Startup Object dropdown list box, located under the Application tab of the Visual Studio 2010 project properties editor (see 2). Note that the signature of Main() is adorned with the static keyword, which will be examined in detail in 5. For the time being, simply understand that static members are scoped to the class level (rather than the object level) and can thus be invoked without the need to first create a new class instance.

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Note C# is a case-sensitive programming language. Therefore, Main is not the same as main, and Readline is not the same as ReadLine. Be aware that all C# keywords are lowercase (e.g., public, lock, class, dynamic), while namespaces, types, and member names begin (by convention) with an initial capital letter and have capitalized the first letter of any embedded words (e.g., Console.WriteLine, System.Windows.Forms.MessageBox, System.Data.SqlClient). As a rule of thumb, whenever you receive a compiler error regarding undefined symbols , be sure to check your spelling! 74

In this chapter, you learned how to use forms authentication to implement authentication systems that simplify life and provide a great deal of flexibility. You also learned how to protect passwords and how you can use any data source for credential storage. In the next chapter, you ll learn about the new features that are built on top of forms authentication and that make it even easier to create login pages and deal with user authentication without writing all the code yourself.

Currently, the insert, update, and delete logic for the InventoryDAL type uses hard-coded string-literals for each SQL query. As you might know, you can use a parameterized query to treat SQL parameters as objects, rather than as a simple blob of text. Treating SQL queries in a more object-oriented manner helps reduce the number of typos (given strongly typed properties); plus, parameterized queries typically execute much faster than a literal SQL string because they are parsed exactly once (rather than each time the SQL string is assigned to the CommandText property). Parameterized queries also help protect against SQL injection attacks (a well-known data access security issue). To support parameterized queries, ADO.NET command objects maintain a collection of individual parameter objects. By default, this collection is empty, but you can insert any number of parameter objects that map to a placeholder parameter in the SQL query. When you wish to associate a parameter within a SQL query to a member in the command object s parameters collection, you can prefix the SQL text parameter with the @ symbol (at least when using Microsoft SQL Server; not all DBMSs support this notation).

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