ASP.NET 2.0 - Master Pages
Master pages provide templates for other pages on
your web site.
Master Pages
Master pages allow you to create a consistent look and behavior for all the pages
(or group of pages) in your web application.
A master page provides a template for other
pages, with shared layout and functionality. The master page
defines placeholders for the content, which can be overridden by content pages.
The output result is a combination of the master page and the content page.
The content pages contains the content you want to display.
When users request the content page,
ASP.NET merges the pages to produce output that combines the layout of the master page with the content
of the content page.
Master Page Example:
<%@ Master %>
<html>
<body>
<h1>Standard Header For All Pages</h1>
<asp:ContentPlaceHolder id="CPH1" runat="server">
</asp:ContentPlaceHolder>
</body>
</html>
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The master page above is a normal HTML page designed as a template for
other pages.
The @ Master directive defines it as a master page.
The master page contains a placeholder tag <asp:ContentPlaceHolder> for
individual content.
The id="CPH1" attribute identifies the placeholder, allowing many
placeholders in the same master page.
This master page was saved with the name "master1.master"
 Note: The
master page can also contain code, allowing dynamic content.
Content Page Example:
<%@ Page MasterPageFile="master1.master" %>
<asp:Content
ContentPlaceHolderId="CPH1" runat="server">
<h2>Individual Content</h2>
<p>Paragrap 1</p>
<p>Paragrap 2</p>
</asp:Content>
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The content page above is one of the individual content pages of the web.
The @ Page directive defines it as a standard content page.
The content page contains a content tag <asp:Content> with a reference
to the master page (ContentPlaceHolderId="CPH1").
This content page was saved with the name "mypage1.aspx"
When the user requests this page, ASP.NET merges the content page with the
master page.
Click to display mypage1.aspx.
Note: The
content text must be inside the <asp:Content> tag. No content is allowed outside
the tag.
Content Page With Controls:
<%@ Page MasterPageFile="master1.master" %>
&br<asp:Content
ContentPlaceHolderId="CPH1" runat="server">
<h2>W3Schools</h2>
<form runat="server">
<asp:TextBox id="textbox1" runat="server" />
<asp:Button id="button1" runat="server" text="Button" />
</form>
</asp:Content>
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The content page above demonstrates how .NET controls can be inserted into
the content page just like an into an ordinary page.
Click to display mypage2.aspx.
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