Use master page (C#)
<%@ page language="C#" MasterPageFile="MasterPage3.master" %> <script runat="server" language="c#"> </script> <asp:content id="Content1" contentplaceholderid="ContentPlaceHolder1" runat="server"> cool stuff! </asp:content> <%-- MasterPage3.master <%@ master language="C#" %> <script runat="server"> </script> <html> <head runat="server"> <title>Untitled Page</title> </head> <body> <form runat="server"> <table id="Table1" cellspacing="1" cellpadding="1" width="100%" border="1"> <tr> <td colspan="2"> <h1>My Little Company</h1> </td> </tr> <tr> <td>Navigation?</td> <td> <asp:contentplaceholder id="ContentPlaceHolder1" runat="server"> </asp:contentplaceholder> </td> </tr> <tr> <td> </td> <td> </td> </tr> </table> </form> </body> </html> --%>