Here’s the code, we use a class to do the selection and the rel attribute to help define the validation group so we can only hide the button if the form has been validated successfully.

<asp:Button ID=”btnProceed” runat=”server” CssClass=”submit-once” rel=”UserProfile” ValidationGroup=”UserProfile”  Text=”Proceed” OnClick=”btnProceed_Click”  />

And here’s the sprinkling of jquery you will need (stick it in you base master page for example).

$(document).ready(function() {

// ensure that buttons are only clicked once with this class

$(“.submit-once”).click(function() {

if (Page_ClientValidate($(this).attr(“rel”))) {

$(this).after(“Please wait..”).hide();

}

});

});