ContentPlaceHolder Web Server Control Declarative Syntax
Creates a region for content in an ASP.NET master page.
<asp: ContentPlaceHolder
EnableViewState="True|False"
ID="string"
OnDataBinding="DataBinding event handler"
OnDisposed="Disposed event handler"
OnInit="Init event handler"
OnLoad="Load event handler"
OnPreRender="PreRender event handler"
OnUnload="Unload event handler"
runat="server"
Visible="True|False"
>
<!-- child controls -->
</asp:ContentPlaceHolder>
Remarks
A ContentPlaceHolder control defines a relative region for content in a master page and renders all text, markup, and server controls from a related Content control that is found in a content page.
A Content control is associated with a ContentPlaceHolder using its ContentPlaceHolderID property. Set the ContentPlaceHolderID property to the value of the ID property of the related ContentPlaceHolder control in a master page. More than one ContentPlaceHolder can be declared in a master page. For more information about master pages, see ASP.NET Master Pages.
Example
The following code example shows how to use the ContentPlaceHolder control to define a content region for a master page. The Web page is a master page and defines a content region using a ContentPlaceHolder control. A content page references this master page by setting the MasterPageFile attribute of the @ Page directive and defining Content controls.
<%@ Master Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MasterPage Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:contentplaceholder id="ContentPlaceHolder1" runat="server" />
</div>
</form>
</body>
</html>
<%@ Master Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MasterPage Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:contentplaceholder id="ContentPlaceHolder1" runat="server" />
</div>
</form>
</body>
</html>