Avoid to display previous page after logout?

Hi,

I create a consistent layout for the pages using web usercontrol as below,

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Header.ascx.cs" Inherits="M2iSTS2.UserControl.Header" %>

<link href="/Styles/styles.css" rel="stylesheet" type="text/css" />

 <div id="header" class="header">
  	<h1 class="h1">TrackU: Student and Vehicle Tracking System</h1>
    <p class="p"><a class="a" href="/Account/login.aspx">Logout</a></p>
  </div>
  <div>
  	<ul class="ul">
    	<li class="li"><a class="lia" href="/Admin/Fleet.aspx">Fleet</a></li>
        <li class="li"><a class="lia" href="/Admin/StudentInfo.aspx">Student Info</a></li>        
        <li class="li"><a class="lia" href="/Admin/RouteSettings.aspx">Route Settings</a></li>        
        <li class="li"><a class="lia" href="/Admin/Reports.aspx">Reports</a></li>        
    </ul>
  </div>

when i click logout link in each page, it redirect to login.aspx.Then,
when i click back button in browser it go back to previous page, not to login page.

when use the logout as server control inside a form tag,
cant add another form inside the server-form.



how to avoid this?

Thanks

Tags: ASP.NET