How to make CheckBoxList Validator

Question

I have Checkboxlist and i can't give it required field validator or custom validator. it gives me runtime exception.

Language : Vb.net with asp.net

Answer 1

no cannot apply required field validator on the checkbox list

but you can use custom validator to validate it

for the custom validator to work you have to create your own function on server or client side for validation and one more thing when you are using custom validator there no need to pass value in the controltovalidate property

Answer 2

Its working and here is the code

function CheckBoxListValidator(source, arguments) {
            var Control;
            Control = document.getElementById("CKlistVehicleBodies").getElementsByTagName("input");
            var check = false;
            if (eval(Control)) {
                for (var i = 0; i < Control.length; i++) {
                    if (Control[i].tagName == 'INPUT') {

                        if (Control[i].checked) {
                            check = true;
                        }
                    }
                }
                if (!check)
                    arguments.IsValid = false;
                else
                    arguments.IsValid = true;
            }
        }