A variety of HTML elements, such as text boxes, check boxes, radio buttons, drop-down lists and more, can be used in forms. NET applications are collecting information from a user, you want to ensure that the data that you collect is valid. While this may sound like quite a chore, it is really quite simple since new custom controls can extend the functionality of existing controls. If the control is found, the control is cast to a method returns a boolean that indicates whether or not the value in the control to be validated is valid or not. How to Overcome any Shortcoming Now that we've identified a problem with one of the ASP. In the remainder of this article we'll look at how to build a custom Web control (nicely named Required Field Validator For Check Box Lists) that will encapsulate the desired functionality. You may wish to raise an exception at this point, for just returning false will cause the page to render like normal, just without the validation control. However, there is an article here on 4Guys that examines how to create custom Check Box and Check Box List validation controls, although it's done as an ASP. For more information, refer to Creating Validator Controls for the Check Box and Check Box List. Validation controls are a set of server-side Web controls that developers can add to their ASP. For example, the Required Field Validator validation control can be placed on an ASP. I needed to do this to get everything working properly. NET's client-side library integrate with this custom validation control, please let me know!
Per the documentation, for any validator control the "standard controls that can be validated are Text Box, List Box, Drop Down List, Radio Button List, System. NET Web pages that use the control (see the following example for the syntax). NET Web page shows a simple example of using this custom control to validate a Check Box List - a task that was impossible using the built-in Required Field Validator. ] Conclusion In this tip we looked at how to create a very simple required field validator validation Web control that could handle Check Box Lists.
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Validating radiobuttonlist comments