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Validation server controls are a series of controls that help you validate the data that the user enters into the other controls that are provided with ASP. They determine whether the form can be processed based upon the rules that you define in the validation server controls.One of the most common elements of Web pages is a form in which the user can input data that is posted back to the server.The bad thing about server-side validation is that it requires trips back and forth to the server.This takes a lot of resources and makes for a slower-paced form for the user.

One of the first steps is to understand what validating data code that is not working: i need to validate a dropdownlist (ddl State) in a c# contains the items: Items Index (Select a state) 0 Arizona 1 California 2 ....If the data is incorrect or not valid, you can send back a response stating this.If, however, when the user clicks the Submit button, a scripting language that is part of the overall HTML page is initiated to check the validity of the data before it is sent to the server, this is client-side validation.

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NET, you might have been introduced to a number of different types of controls, whether HTML server controls or Web server controls.

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