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Users with harmful intent may easily modify the validation script because it is contained in the source of the page that is sent to the user's computer.
The malicious user can then submit the modified script to the Web server with results that are different than what you, the developer, intended.
NET and Web Services Solutions conference produced by PRO. He has also worked with large corporate clients including Microsoft, Universal Studios, MGM Studios, Monster.com/Flip Dog.com, Intel, Polygram Pictures, Prudential, Micro Accounting Systems, Sky Harbor International Airport, and Southern Automated Systems on projects using Microsoft technologies such as Visual Fox Pro, Visual Studio. Most applications perform their data validation on the user's local computer.
He is a published author on several subjects including XML, the migration from Visual Basic 6 to VB. In this scenario, if an error occurs while performing validation on the user's computer, the application can directly display the error message on the page that the user is viewing without the page making a round trip to the Web server and then back to the user.
View code (Razor): The model validation script parses loaded DOM searching for forms that contain validation metadata.
The parsing is only done after the initial page load, so the forms that were loaded via callbacks after the page load are not parsed.
Ever since the first dynamic website was created, form validation has been an important subject.
Getting user input through the system requires much attention, and with previous serverside scripting languages, there were no standard way of dealing with form validation.
Shannon Horn is the co-founder and chief software architect of Web Geniuses Corporation ( Hence, many times validation was not performed in a uniform manner, complex validation was difficult to implement, and Web servers were vulnerable to validation scripts being modified by malicious users.However, when you validate a process on the Web server, you can use any scripting language because the user's Web browser doesn't process the scripting language.Furthermore, the data validation scripts are protected inside the Web server so they are not vulnerable to malicious user modifications.In this example, the button click event is handled on the client.The event handler forces the parsing of the required form using the $.validator.unobtrusive.parse() method that enables client-side validation.
The alternative to processing data validation on the user's computer is to process it on the Web server.