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In both the is False, the Check Box must be unchecked for the validation control to indicate validity.At this point, we have all of the needed server-side functionality for the Check Box Validator control.Many Web pages with Terms of Service include a Check Box titled "I agree to the above terms" that must be checked before continuing.Likewise, a Web Form may contain a set of options in the form of a Check Box List. (Check Box Lists present a list of grouped check boxes for the user to select one or more checkboxes from.) If you specify a Required Field Validator's property to the ID of a Check Box List Web control you will get an exception informing you that the Check Box List cannot be validated. For example, Required Field Validators do not work with the Check Box List Web controls.aspdotnet-suresh offers C#articles and tutorials,csharp dot net,articles and tutorials, VB.
To provide such validation, we have three choices: In this article we'll implement the third option, creating two custom server controls, Check Box Validator and Check Box List Validator. The server controls provided in this article were designed using Visual Studio 2005 and the . NET 1.x, check out Creating a Validation Control for Check Box Lists. 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. NET server control that can be used in place of a Required Field Validator for Check Box List Web controls. NET is that you can simply create a new custom Web control that includes the desired functionality. NET, create a file with a property is not set or is set to a nonexistent server control, the property will return false.The download at the end of this article includes both the entire source code and a compiled assembly that you can drop into your ASP. NET Framework 2.0's base class libraries; consequently, they will only work in ASP. Alternatively, you may adapt the code presented here to work in ASP. The server controls examined in this article were designed using Visual Studio 2005 and the . NET 1.x, check out Creating a Validation Control for Check Box Lists.NET Framework 2.0's base class libraries; consequently, they will only work in ASP. Alternatively, you may adapt the code presented here to work in ASP. A validation control's primary responsibility is to determine whether or not its assigned control's value is valid.