Master pages exposing an object model for content pages to programmatically modify elements on the master.

<%@ Page Language="C#" MasterPageFile="Default.master" 
    AutoEventWireup="true" CodeFile="Default.aspx.cs" 
    Inherits="Default" 
    Title="Hello, Master" 
    %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentOfThePage" runat="server">
    <h1>Welcome to this page!</h1>
    <h3>master!</h3>
</asp:Content>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Drawing;

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        ((ASP.MasterWithProp)Master).TitleBoxText = "ASP.NET";
        ((ASP.MasterWithProp)Master).TitleBoxForeColor = Color.Cyan;

    }
}

File: Default.master

<%@ Master  Language="C#" AutoEventWireup="true" CodeFile="Default.master.cs" 
    Inherits="MasterPages_SimpleWithProp" Classname="MasterWithProp" %>

<!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>Hello, master pages</title>
</head>
<body>
    <div id="pageContent">
        <form id="form1" runat="server">
            <asp:Panel ID="HeaderPanel" runat="server" Height="50px" Width="100%">
                <asp:Label ID="TitleBox" 
                           runat="server" 
                           EnableTheming="False" 
                           Font-Bold="True" 
                           Font-Names="Impact"
                           Text="Anything" 
                           Width="100%"></asp:Label>
            </asp:Panel>

            <asp:contentplaceholder id="ContentOfThePage" runat="server">
            </asp:contentplaceholder>

            <asp:Panel ID="Panel1" 
                       runat="server" 
                       BorderStyle="Outset"
                       BorderWidth="1px" 
                       Width="100%" 
                       HorizontalAlign="Right">
                <asp:Label ID="SubTitleBox" 
                           runat="server" 
                           EnableTheming="False" 
                           Font-Bold="True" 
                           Font-Names="Lucida Console"
                           Text="sub title" 
                           Font-Size="Large" 
                           ForeColor="Orange"></asp:Label>
            </asp:Panel>        
        </form>
    </div>
</body>
</html>

File: Default.master.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;

public partial class MasterPages_SimpleWithProp : System.Web.UI.MasterPage
{
  public string TitleBoxText
  {
    get { return TitleBox.Text; }
    set { TitleBox.Text = value; }
  }

    public Color TitleBoxForeColor
    {
        get { return TitleBox.ForeColor; }
        set { TitleBox.ForeColor = value; }
    }
}

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Master pages exposing an object model for content pages to programmatically modify elements on the master. : Master page « User Control and Master Page « ASP.Net

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