MasterPage kullanımda kontrollerin ID mevzusu

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="DefaultMaster.aspx.cs" Inherits="DefaultMaster" Title="Untitled Page" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js"></script><script src="jquery.maskedinput-1.2.2.min.js" type="text/javascript"></script>
 <script type="text/javascript">

        jQuery(function($) {

            $("#<%=date.ClientID %>").mask("99/99/9999");

            $("#<%=phone.ClientID %>").mask("(999) 999-9999");

            $("#ctl00_ContentPlaceHolder1_tin").mask("99-9999999");

            $("#ctl00_ContentPlaceHolder1_ssn").mask("999-99-9999");

        });   

    </script>
</asp:Content>


<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <table border="0">
        <tbody>

            <tr><td>Date</td><td><asp:TextBox runat="server" ID="date" /></td><td>99/99/9999</td></tr>

            <tr><td>Phone</td><td><asp:TextBox runat="server" ID="phone" /></td><td>(999) 999-9999</td></tr>

            <tr><td>Tax ID</td><td><asp:TextBox runat="server" ID="tin" /></td><td>99-9999999</td></tr>

            <tr><td>SSN</td><td><asp:TextBox runat="server" ID="ssn" /></td><td>999-99-9999</td></tr>

        </tbody>
    </table>
</asp:Content>