public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    filters.Add(new SiteAuthorizeAttribute());
}

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="WebAppSingleSubmit._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
    <script type="text/javascript">
        $(document).ready(function () {
            $("input[type=submit]").click(function (e) {
                if ((typeof (Page_ClientValidate) == 'function') && (Page_ClientValidate() == false)) {
                    return false;
                }
                if (!confirm("آیا مطمئن هستید؟")) {
                    return false;
                }
                this.disabled = true;
                this.value = 'در حال پردازش اطلاعات ...';

                __doPostBack($(this).attr('name'), '');
            });
        });
    </script>
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <p>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1"
            ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
    </p>
</asp:Content>

....click(function(e) {
        e.preventDefault() // stop the automatic form submission

dec.ToString("G29")