If your "button" is a button
element, make sure you explicity set the type
attribute, otherwise the WebForm will treat it as submit by default.
<button id="button1" type="button">Go</button>
If it's an input
element, do so with jQuery with the following:
$('#button1').click(function(e){
e.preventDefault();
// Code goes here
});
Read more: event.preventDefault()
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