How to increase session time in my Website

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ASP.NET

I'm Using Following code in webconfig but No use ,

sessionstate mode="InProc" cookieless="true" timeout="1440"


And .,

Code at Gobal.asax

void Session_Start(object sender, EventArgs e)
  {
      // Code that runs when a new session is started
      Session.Timeout = 1440;
  }

both code in My site but Not work ,

Anyone Give Right Solution !