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As previously mentioned, the save() function takes a formatted array (usually the automatically formatted $this->data array) and saves its values to matching fields in the database. Some other parameters are available for this function that allow for data validation and specifying to which fields the data will be saved (see Table 7-6). Table 7-6. Parameters, in Order, Available in the save() Model Function

acceptable in an HTML document because it doesn t include any extended characters). A clever hacker could reverse-engineer this string and examine your view state data in a matter of seconds.

3. In the Set Cell box, type or click cell B12. 4. In the To Value box, type -239. 5. In the By Changing Cell box, type or click cell B11. 6. Click OK, and click OK again. Answer: The interest rate for a $12,999 loan, a 5-year term, and a $239.00 monthly payment is 3.93%.

If you want to make view state more secure, you have two choices First, you can make sure the view state information is tamperproof by instructing ASPNET to use a hash code A hash code is sometimes described as a cryptographically strong checksum The idea is that ASPNET examines all the data in view state, just before it renders the final page It runs this data through a hashing algorithm (with the help of a secret key value) The hashing algorithm creates a short segment of data, which is the hash code This code is then added at the end of the view state data, in the final HTML that s sent to the browser When the page is posted back, ASPNET examines the view state data and recalculates the hash code using the same process.

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, ASPNET 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 ASPNET 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.

The data, keyed by field and value, to be saved to the database Triggers data validation as specified in the corresponding model A list of fields to which data is allowed to be written

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.