How to set aspx value in checkbox

I have checkbox in with dev express controls  if i click on that dev expres check box it will go to java script validation.In Java script ,if validation fails

I want to uncheck the checkbox in

can u please help me how to set check box value in java script?
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It is not at all clear, at least to me,  what you are trying to do.

Could you please clarify?
You need to share your javascript code and the checkbox.
But here's a simple example:
<asp:CheckBox ID="CheckBox1" runat="server" onclick='validate(this);' />

function validate(cb) {
    //if validation fails set to false
       cb.checked = false;

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