Validating two usercontrols

This visual interface is implemented by the addition of one or more Windows controls to the designer surface.In the following demonstration, you will incorporate Windows controls into your composite control and write code to implement functionality.

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To put your control to use, you will need to host it on a form.

As with a standard composite control, an inherited composite control cannot stand alone and must be hosted in a form or other container.

The process of deriving a class from a base class is called by overriding parent methods and adding new methods and properties.

The first step in creating an inherited control is to derive it from its parent.

Developers had to write their own validation routines and cut and paste them in the various ASP scripts that needed to employ form validation techniques. Rather, it will dissect a particular control, the Custom Validator validation control.

(For more information on the other validation Web controls be sure to read Server Control Form Validation.) By simply using the first four ASP.

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.

As such, it might consist of one or more Windows Forms controls, components, or blocks of code that can extend functionality by validating user input, modifying display properties, or performing other tasks required by the author.

Composite controls can be placed on Windows Forms in the same manner as other controls.

Test your control's run-time behavior and exercise its properties with the User Control Test Container.

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