For example, in a Web site like where users are entering shipping and billing information, it is vital that the user enter credit card numbers, zip codes, email addresses, and other information in an acceptable format.With classic ASP, performing form field validation was annoying, at best. NET fixes all of this by its use of validation Web controls. NET Web controls designed specifically to validate form field entries. NET contains a Required Field Validation control, which, as its name suggests, can be used to ensure that the user enters a value into a form field (such as a Text Box). NET provides the following form field validation controls: This article does not aim to discuss the specifics of all of these validation Web controls.A Combo Box displays a text box combined with a List Box, which enables the user to select items from the list or enter a new value .The user can type a value in the text field or click the button to display a drop down list.For example, imagine that you had a questionnaire that asked the user a number of questions in radiobutton and checkbox form.Imagine that you had a series of checkboxes that corresponded to the hobbies sports, reading, and swimming, and you asked the ready to check all hobbies that he enjoyed. Net Regular Expression Validator samples to validate Minimum and Maximum text Length and also different configurations like Alphanumeric with special characters, Alphanumeric, Alpha and Numeric configurations. Net Validator controls like Required Field Validator, Regular Expression Validator, Compare Validator, Range Validator and Custom Validator inside the ASP.
Below are the ways to get the value from all types of form elements.
boolean is Validate Root() Calls to revalidate that come from within the textfield itself will be handled by validating the textfield, unless the textfield is contained within a JViewport, in which case this returns false.
C# controls are located in the Toolbox of the development environment, and you use them to create objects on a form with a simple series of mouse clicks and dragging motions.
When you submit a form to a CGI program that resides on the server, it is usually programmed to do its own check for errors.
If it finds any it sends the page back to the reader who then has to re-enter some data, before submitting again.