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None of the built in validators will validate the asp: Check Box List, so you will have to create your own.

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.

Page validation determines whether the input controls that are associated with a validation control on the page all pass the validation rules as specified by the validation control.

The Pre Render event is raised just before the control is rendered on the page, so it the best moment to inject some client side functionality into the page.

First I check if the client validation is enabled, and, if it is, I write on the page the javascript method, and more important, the code to tell the common validation script to call my "cb_verify" function to validate the value of the control.

If you set a validation control's , stating: "Control 'control ID' referenced by the Control To Validate property of 'validation Control ID' cannot be validated." There may be times, however, when you need to provide validation for a Check Box or Check Box List.

Many Web pages with Terms of Service include a Check Box titled "I agree to the above terms" that must be checked before continuing.

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