My web page redirect users to login page when the page is idol for a while, i dont like such. I want the application to check if the user is authenticated if not redirect to login but yes let the user stay, i dont want the authenticated users to be redirected to login page if  the page is domant for a while. web.conf

<?xml version="1.0" encoding="utf-8"?>
<!--
  
  -->
<configuration>
  <connectionStrings>
   // connection here
  </connectionStrings>
  <system.web>
    <sessionState timeout = "30"/>
    <httpRuntime executionTimeout="240" maxRequestLength="265600" />
    <customErrors defaultRedirect="~/Account/LockScreen.aspx" mode="Off" />
    <authorization>
      <deny users="?" />
    </authorization>
    <authentication mode="Forms">
      <forms defaultUrl="Home.aspx" loginUrl="Default.aspx" slidingExpiration="false" />
    </authentication>
    <compilation debug="true" targetFramework="4.5">