Avoid button click


 <script type="text/javascript">
      function DisableButton() {
          document.getElementById("<%=contact_submit.ClientID %>").disabled = true;
      }
      window.onbeforeunload = DisableButton;
    </script>



<asp:Button type="button" id="contact_submit" class="btn btn-dm" runat="server" onserverclick="btnSendMessages_Click" validationgroup="ContactUSGroup" Text="SEND YOUR REQUEST"/>

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