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Cookies are not validated or encrypted. This has a slight performance benefit, but it means that malicious users could read and or alter cookie information. Only consider using this option if your application requires SSL (HTTPS) because cookies are encrypted along with all other communications over SSL connections. Creates a MAC by hashing the cookie data using a validation key. The resulting MAC hash is then appended to the cookie data. When ASP.NET receives the cookie on a subsequent request, it hashes the cookie data using the same validation key and checks the result against the MAC hash in the cookie. If both items match, then the data in the cookie has not been altered and the cookie is considered valid. Cookie data is encrypted using DES or Triple DES encryption and stored in the cookie. On subsequent requests, ASP.NET decrypts the cookie data. Validation isn t used in this scenario, so the cookie may be susceptible to attacks. You specify the encryption algorithm in the <machineKey> element in Machine.config or Web.config. Applies both Validation and Encryption to the cookie. All is the most secure option and is therefore both the recommended and default option as well.

You can also add resources as text files to the application. These text files consist of key/value pairs, one per line, in the format key = value. They can be compiled with the resgen.exe tool into a binary format with the file extension .resources. You can then add such .resources files as embedded resources (BuildAction=EmbeddedResource) to your application. But because this is the old way of managing resources, we suggest not using it.

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The postback mechanism in ASP.NET provides a means of generating client-side state as well as the opportunity to receive input from the user. The first part of this chapter concentrated on client-side state. Now, we focus on interacting with the normal HTML form input elements. Many controls model themselves after <input> tags and provide value-added features, such as remembering state and raising events to their clients when internal state changes occur. To work with the HTTP POST mechanism to retrieve data, one implementation would be for the client to simply read all of the form variables directly. Fortunately, ASP.NET provides a more organized mechanism to server controls that implement the IPostBackDataHandler interface.

While going through the following web application sample, you will learn how you can use resources both for populating control properties and for getting some other information such as document templates for report generation. The web application requires users to enter their first name, last name, and age. Based on this information, the application generates a simple Microsoft Word document. For this purpose, a template of the Microsoft Word document to be generated is bound to an XML schema, saved in XML format, and added as an embedded resource.

Defines whether an SSL connection is required to send the authentication cookie. When set to True, ASP.NET informs the browser that the cookie should only be sent over a secure connection.

The XML features of Microsoft Office 2003 introduced in this chapter require Microsoft Word 2003 Professional Edition on the client (not on the server). If you don t have Microsoft Word 2003, you can test the same concepts with your own custom file templates. If you want to learn more details about Microsoft Office 2003 and XML, browse to http://msdn.microsoft.com/office.

The IPostBackDataHandler interface is the recommended method to read form post data from a control in ASP.NET without having to use the Page class and its Request object.

All strings as well as the Microsoft Word document used in the application are embedded as resources. After adding an assembly resource file to the project, Visual Studio offers a resource editor for modifying the contents of the .resx file. It enables you to add strings as well as any other type of file to the project, as shown in Figure 17-1.

Forms Authentication also supports a <credentials> section that allows you to hard-code users and passwords directly in Web.config. This was a quick and dirty way for developers to create users for a Forms application without having to use a database. It was seldom used in ASP.NET 1.1, and its use will continue to decline because of the built-in membership and role providers in ASP.NET 2.0 (see 5). For the sake of completeness, however, Listing 12-4 shows an example of how to use the <credentials> element. Listing 12-4. Configuringing Forms-Based Users with the <credentials> Element <configuration> <system.web> <authentication mode="Forms"> <forms> <credentials passwordFormat="Clear"> <user name="UserA" password="PasswordA"/> <user name="UserB" password="PasswordB"/> <user name="UserC" password="PasswordC"/> </credentials> </forms>

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