<body>
     <form id="form1" runat="server">
     <div>
         <asp:ScriptManager ID="ScriptManager1" runat="server" />
         <asp:UpdatePanel runat="server" ID="UpdatePanel1">
           <ContentTemplate>
             <asp:Button runat="server" ID="Button1"
               Text="Kliknij" OnClick="Button1_OnClick" />
           </ContentTemplate>
         </asp:UpdatePanel>
     </div>
     <br />
     <br />
     <div id="Message" style="visibility: hidden;">
         <asp:HyperLink ID="HyperLink1" Font-Bold="true" Text="Wystąpił błąd..." Font-Italic="true" ForeColor="red" runat="server"></asp:HyperLink>
     </div>
     </form>
</body>
