How can you achieve nested Masterpages in 2.0?

Question Posted / swapna

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How can you achieve nested Masterpages in 2.0?..

Answer / amirtha

Master pages can be nested, with one master page
referencing another as its master. Nested master pages
allow you to create componentized master pages.
A child master page has the file name extension .master, as
with any master page. The child master page typically
contains content controls that are mapped to content
placeholders on the parent master page. In this respect,
the child master page is laid out like any content page.
However, the child master page also has content
placeholders of its own to display content supplied by its
own child pages.

Examples:
This is the parent Master Page:

<% @ Master Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html >
<body>
<head runat="server">
<title>Untitled Page</title>
</head>
<form id="Form1" runat="server">
<div>
<h1>Parent Master</h1>
<p style="font:color=red">This is parent master content.</p>
<asp:ContentPlaceHolder ID="MainContent" runat="server" />
</div>
</form>
</body>
</html>

This is the Child Master Page:

<%@ Master Language="VB" MasterPageFile="~/Parent.master"%>
<asp:Content id="Content1"
ContentPlaceholderID="MainContent" runat="server">
<asp:panel runat="server" id="panelMain"
backcolor="lightyellow">
<h2>Child master</h2>
<asp:panel runat="server" id="panel1"
backcolor="lightblue">
<p>This is childmaster content.</p>
<asp:ContentPlaceHolder ID="ChildContent1"
runat="server" />
</asp:panel>
<asp:panel runat="server" id="panel2"
backcolor="pink">
<p>This is childmaster content.</p>
<asp:ContentPlaceHolder ID="ChildContent2"
runat="server" />
</asp:panel>
<br />
</asp:panel>
</asp:Content>

This is the child file that references the child master
page:

<%@ Page Language="VB" MasterPageFile="~/Child.master"%>
<asp:Content id="Content1"
ContentPlaceholderID="ChildContent1" runat="server">
<asp:Label runat="server" id="Label1"
text="Child label1" font-bold="true" />
<br>
</asp:Content>
<asp:Content id="Content2"
ContentPlaceholderID="ChildContent2" runat="server">
<asp:Label runat="server" id="Label2"
text="Child label2" font-bold="true"/>
</asp:Content>

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