<cms:SecurityCode ID="scCaptcha" GenerateNumberEveryTime="false" runat="server" />
how to use from kentico captcha control and check validity in client side?
Create your own form control that does this. The form control included uses server side validation. Any particular reason you want client side?
Don't quote me on this, but I think you can use the Google Captcha control as client side. Here is an article on integrating it with Kentico.
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