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If you are too lazy or in too big a hurry to create your own validation control, you can quickly whiff up a validation scenario using an asp: Custom Validator. w=560" class="size-full wp-image-1058" title="Validation Error" src="https://briancaos.files.wordpress.com/2012/08/validationerror.png? w=640" alt="" srcset="https://briancaos.files.wordpress.com/2012/08/560w, https://briancaos.files.wordpress.com/2012/08/validationerror.png? w=150 150w, https://briancaos.files.wordpress.com/2012/08/validationerror.png? w=300 300w" sizes="(max-width: 560px) 100vw, 560px" / The custom validator will now execute the validation on server side. Is Valid to ensure that all validations are successfull.SETUP THE LIST AND THE VALIDATOR: First the Check Box List: Validation Error " data-medium-file="https://briancaos.files.wordpress.com/2012/08/validationerror.png? w=300" data-large-file="https://briancaos.files.wordpress.com/2012/08/validationerror.png? APPLY CLIENT-SIDE VALIDATION: The Custom Validator has also a client-side Java Script referenced in the Client Validation Function property.Now there can be other ways to achieve the same thing, for example, you could write a server code in code behind file and loop through checkbox list items and then check if any checkbox is checked or not.However posting a page back to server for such validation is not at desirable, hence a client side validation.Here I am going to show a simple way of checking if any of the checkbox list items is selected or not.It is quite common scenario wherein a form contains checkbox list and that selecting at least one of the options from list is mandatory.aspdotnet-suresh offers C#articles and tutorials,csharp dot net,articles and tutorials, VB.
NET 4.0 and C#", please follow the link below: ASP. NET Validate a Check Box with a Custom Validator in ASP.
In this article I explain how you can validate that at least one checkbox is checked in an asp: Check Box List using an asp: Custom Validator, and how to make it work server side and client side.
None of the built in validators will validate the asp: Check Box List, so you will have to create your own.
This Java Script looks like this: Please also note that since the Control To Validate property cannot be used on a Check Box List you need to hard-select the client ID of the Check Box List in the Java Script.
Update March 11 2016: Updated the code to add client side validation after a few comments pointed out that the default jquery range validator expects numbers and doesn't play nicely with bool parameters (ie. You could use a Custom Validator control, but a nicer and more reusable approach is to build a custom web control that extends the Base Validator.