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It then checks whether the checksum it calculated matches the hash code that is stored in the view state for the page If a malicious user changes part of the view state data, ASP NET will end up with a new hash code that doesn t match At this point, it will reject the postback completely (You might think a really clever user could get around this by generating fake view state information and a matching hash code However, malicious users can t generate the right hash code, because they don t have the same cryptographic key as ASP NET This means the hash codes they create won t match) Hash codes are actually enabled by default, so if you want this functionality, you don t need to take any extra steps.

* { font-family: helvetica, verdana, sans-serif; } div.flash_notice { padding:1em; border: 2px dashed #cecece; margin: 1em 0;} input.submit_button { width:120px; height:30px; }

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</tbody> </table> </span> </div> </body> </html> Most of this code should look pretty familiar. As before, we have our configuration variable. You ll notice that in this example, we re using a Tacos AjaxForm instead of the standard Tapestry Form. The rest of the form is the same as before; however, the submit is taking advantage of Tacos AjaxSubmit component. There are a couple of interesting things. First, the action="listener:addPodcast" attribute tells Tapestry which Java method to fire on the associated Java class. Second, you ll see updateComponents="ognl:{'podcasts'}" which, as you would expect, indicates what you want to update on the page. The third interesting bit is this line: effects="template:{highlight:{any:'[255,255,184], 500, 500'}}". This attribute allows us to tap into a host of effects from the Dojo library, including highlight fadeshow fadehide fade wipein wipeout explode implode slideto slideby slide In this case, we re using the highlight effect to implement the Yellow Fade Technique introduced in 1. At this point, the rest of the template looks quite a bit like the ShowPodcast.html file from earlier except that it s wrapped by a div (representing the component to update) and we re using the Tapestry If component, which conditionally includes the output in the response if a condition is met (in this case, if the name attribute of the Podcast object has a value).

Occasionally, developers choose to disable this feature to prevent problems in a web farm where different servers have different keys (The problem occurs if the page is posted back and handled by a new server, which won t be able to verify the view state information) To disable hash codes, you can use the enableViewStateMac attribute of the <pages> element in the webconfig or machineconfig file, as shown here: <configuration> <systemweb> <pages enableViewStateMac="false" /> .. </systemweb> </configuration> However, a much better way to solve this problem is to configure multiple servers to use the same key, thereby removing any problem 9 describes this technique..

Even when you use hash codes, the view state data will still be readable by the user. In many cases, this is completely acceptable after all, the view state tracks information that s often provided directly through other controls. However, if your view state contains some information you want to keep secret, you can enable view state encryption. You can turn on encryption for an individual page using the ViewStateEncryptionMode property of the Page directive: <%@Page ViewStateEncryptionMode="Always" %> Or you can set the same attribute in a configuration file: <configuration> <system.web> <pages viewStateEncryptionMode="Always" /> ... </system.web> </configuration> Either way, this enforces encryption. You have three choices for your view state encryption setting always encrypt (Always), never encrypt (Never), or encrypt only if a control specifically requests it (Auto). The default is Auto, which means that the page won t encrypt its view state unless a control on that page specifically requests it. (Technically, a control makes this request by calling the Page.RegisterRequiresViewStateEncryption() method.) If no control calls this method to indicate it has sensitive information, the view state is not encrypted, thereby saving the encryption overhead. On the other hand, a control doesn t have absolute power if it calls Page.RegisterRequiresViewStateEncryption() and the encryption mode is Never, the view state won t be encrypted.

Save this file as public/stylesheet/training.css. Now generate a model, which represents students taking the course:

s Don t encrypt view state data if you don t need to do so. The encryption will impose a performance Tip

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