How can I validate that several textboxes contain data when I click submit?
<p>I have 10 defined textboxes with strings.</p>

<p>I have to check all if they are not empty while clicking ok button</p>

<p>whats the cleanest way to check them all and when function is at end. each checkbox which was empty to give this a specific CSSclass. perhaps. ClassError. ( which highlights red) </p>

<p>I'm happy for answers.</p>
