Bonjour à vous tous,

j'aimerai savoir comment empeché le postback de ma page sur le click de ImageButton ?
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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    <ajaxToolkit:ToolkitScriptManager runat="server" ID="ScriptManager1" >
    <Services> 
        <asp:ServiceReference Path="WebServicePopup.asmx" /> 
    </Services> 
    </ajaxToolkit:ToolkitScriptManager> 
    <script type="text/javascript">
        var styleToSelect;
        function ShowMyModalPopup() 
            { 
             var modal = $find('ModalPopupExtender1'); 
             modal.show(); 
             WebServicePopup.ListSites('Site',DisplayResult);
 
            }
         function HideModalPopup() 
            { 
              var modal = $find('ModalPopupExtender'); 
              modal.hide(); 
            }
        function DisplayResult(result)
            {
                var d = $get('lstSiteDiv');
                alert(result);
                d.innerHTML =result;
            }   
 
    </script>
 
        <asp:TextBox ID="TxtInfo" runat="server" ></asp:TextBox>
        <asp:ImageButton CausesValidation="false" ImageUrl="style/images/loupe.gif"  ID="ImageButton1" runat="server" OnClientClick="ShowMyModalPopup();" height="16px" width="16px" />
 
        <br />   
                <asp:Panel ID="Panel1" runat="server" CssClass="modalPopup">
                    <asp:Panel ID="Panel3" runat="server" Style="cursor: move;background-color:#DDDDDD;border:solid 1px Gray;color:Black">
                        <div>
                            <p>Selectionner le site</p>
                        </div>
                    </asp:Panel>
                        <div id="lstSiteDiv"></div>
                        <div>
                             <asp:Button ID="OkButton" runat="server" Text="Ok"/>
                             <asp:Button ID="CancelButton" runat="server" Text="Cancel" />
                        </div>
                </asp:Panel>
 
                <ajaxToolkit:ModalPopupExtender ID="ModalPopupExtender1" runat="server" 
                    TargetControlID="Panel1"
                    PopupControlID="Panel1" 
                    BackgroundCssClass="modalBackground" 
                    CancelControlID="CancelButton" 
                    OnCancelScript ="HideModalPopup()"
                    DropShadow="true"
                 />
Merci