Q:

Disabled asp.net button disables validation for button

I have an aspx page that contains a checkbox, and a button.  The button is disabled by default until the user checks the checkbox.  It looks like when I add the attribute enabled="false" to the button, it removes the validation.  When the button is enabled, I still want the validation to work.  Here is the code and markup for the different parts.
Checkbox:
<asp:CheckBox runat="server" ID="termsCheckBox" />
<label style="display: inline;">
I agree to the Terms & Conditions</label>

Button:
<asp:Button runat="server" ID="registerButton" OnClick="registerButton_Click1" 
Text="Register" Enabled="false" ValidationGroup="accountValidation" />

JQuery:
<script type="text/javascript" language="javascript">
$(document).ready(function () {
    $('#<%=termsCheckBox.ClientID %>').click(function () {
        var checked = $(this).val();

        if (checked != undefined)
            $('#<%=registerButton.ClientID %>').removeAttr('disabled');
        else
            $('#<%=registerButton.ClientID %>').attr('disabled', 'disabled');
    });
});
</script>

A:

I think it would work if you enabled/disabled the button on the checkBox server-side event rather than client side since the associated client-side validation code will be generated to run for ValidationGroup of the button

