<div style="text-align: center;">
            <label id="lblFileZip" runat="server">
                File da importare:</label>
            <asp:FileUpload ID="FileUploadXls" runat="server" CssClass="inputVeryLarge" /><br />          
            <asp:Button ID="buttSalva" runat="server" CssClass="Button" OnClick="buttSalva_Click"
                Style="margin-top: 10px; margin-bottom: 10px" Text="Import" OnClientClick="document.getElementById('idLoad').style.display = 'block'; document.getElementById('buttSalva').style.display = 'none';" /><br />
             <div style="display:none; text-align:center" id="idLoad">Caricamento in corso. Attendere<br /><img src="images/indicator_medium.gif"  alt="carimento"/></div>              
             <asp:Label ID="LabelErr" runat="server" Style="margin-top: 10px" Text=""
                Font-Bold="True" ForeColor="Red" Visible="false"></asp:Label>
        </div>