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I have not found the same as or related to my question above.
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I am learning asp.net mvc 2.
After downloading the rendered page, the visitors have a chance to manipulate the html contents ILLEGALLY and submit it back to the server. In MVC, how can I avoid this issue?
You cannot prevent anything on the user side. Therefore you must ensure that the server reacts correctly to manipulated input.
Note that the automatic model binding is tricky: both over- and under-posting can cause trouble.
This is an excellent post on that topic: http://bradwilson.typepad.com/blog/2010/01/input-validation-vs-model-validation-in-aspnet-mvc.html