asp.net – How to prevent a page from posting back using javascript

I\’ve checked other code, and it looks like I just need to add return false to make it work. But, it\’s not working because it still posts back the page.

 <asp:Button ID=\"_btnSearch\" Text=\"Search\" onclientclick=\"CheckForEmptySearchBox()\" />


     <script type = \"text/javascript\">
        function CheckForEmptySearchBox() 
       {
            var boxContent = document.getElementById
              (\"_ctl0_contentMain__lvTSEntry_ctrl0__txtClientName\").value;
            if (boxContent == null || boxContent == \"\") {
                alert(\"Please enter search criteria\");

                return false;
            }
        }  
    </script>

Thanks for helping

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