Development ASP.Net Tutorial

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  4. A Master Page enables you to share the same content among multiple content pages
File: Default.master
<%@ Master Language="C#" %>
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">


    
        html
        {
            background-color:silver;
            font:14px Arial,Sans-Serif;
        }
        .content
        {
            margin:auto;
            width:700px;
            background-color:white;
            border:Solid 1px black;
        }
        .leftColumn
        {
            float:left;
            padding:5px;
            width:200px;
            border-right:Solid 1px black;
            height:700px;
        }
        .rightColumn
        {
            float:left;
            padding:5px;
        }
        .clear
        {
            clear:both;
        }
    
    Simple Master


    
    
        
                            id="ContentPlaceHolder1"
                runat="server"/>
        

        
                            id="ContentPlaceHolder2"
                runat="server"/>
        

        
    

    


The content page uses the Master Page, Default.master.
The Master Page is associated through the MasterPageFile attribute. 
This attribute contains the virtual path to a Master Page.
You must place all the content contained in a content page within the Content controls. 
Otherwise, you get an exception.
File: SimpleContent.aspx
<%@ Page Language="C#" MasterPageFile="~/Default.master" %>
    ID="Content1"
    ContentPlaceHolderID="ContentPlaceHolder1"
    Runat="Server">
    Content in the first column
    Content in the first column

    ID="Content2"
    ContentPlaceHolderID="ContentPlaceHolder2"
    Runat="Server">
    Content in the second column
    Content in the second column