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Finally, the Cookie value is included in the HTTP response Interestingly, the URL fields at the bottom of the page are blank Not until the next roundtrip to the server does ASPNET have a chance to access the current state and populate the fields at the bottom of the page The reason for this is that when you click Set State, the Page_Load event fires first, which executes the GetClientState() helper method GetClientState() loads.

Information is clearly visible to the user and to anyone else who cares to eavesdrop on the Internet The enterprising user might decide to modify the query string and supply new values, which your program won t expect and can t protect against Many browsers impose a limit on the length of a URL (usually from 1 to 2 KB) For that reason, you can t place a large amount of information in the query string and still be assured of compatibility with most browsers Adding information to the query string is still a useful technique It s particularly well suited in database applications where you present the user with a list of items corresponding to records in a database, like products The user can then select an item and be forwarded to another page with detailed information about the selected item.

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Microsoft created the New Technology File System (NTFS) to address security concerns regarding users, groups, and access rights to files and folders. NTFS allows you to create fileand folder-level permissions that define who can access files, list folder contents, and even execute applications. Security in IIS and the file authorization module in ASP.NET rely on NTFS permissions to determine whether or not to fulfill a request. You can configure NTFS permissions by right-clicking on a file or folder in Windows Explorer and selecting Properties from the context menu. This displays the file/folder properties dialog box. Select the Security tab to view the NTFS permissions, which are shown in Figure 12-18.

One easy way to implement this design is to have the first page send the item ID to the second page The second page then looks that item up in the database and displays the detailed information You ll notice this technique in e-commerce sites such as Amazoncom..

the current values from the various state storage mechanisms into the labels on the bottom portion of the web form. Because the server-side click event SetStateButton_Click has not had a chance to fire just yet, the state loaded into the fields at the bottom of the web form by GetClientState() in Page_Load is the previous state, as shown in Figure 3-4. After the Page_Load event completes, SetStateButton_Click executes next, calling SetClientState(), which loads the value from the TextBox control into all the client-state mechanisms. The resulting page shows that all the state mechanisms are storing the value. Now that the state has been set, clicking the Submit button one more time forces a roundtrip to the server, executing the Page_Load event. This time around, the fields at the bottom of the page have a chance to pick up the current state in GetClientState() and display the expected values. The only difference between Figure 3-4 and Figure 3-5 is that the browser notices our hyperlink has a nonblank URL and displays the link text in blue underlined font.

ADO.NET does not include a connection pooling mechanism. However, most ADO.NET providers implement some form of connection pooling. The SQL Server and Oracle data providers implement their own efficient connection pooling algorithms. These algorithms are implemented entirely in managed code and in contrast to some popular misconceptions do not use COM+ enterprises services. For a connection to be reused with SQL Server or Oracle, the connection string matches exactly. If it differs even slightly, a new connection will be created in a new pool.

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