Getting error while using the Session in c#

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ASP.NET

I am getting error while i am using session variable to store the value.
I am getting Exception " Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive "

and my web.Config file is

<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <sessionState mode="InProc" timeout="60" cookieless="false" />
    <pages enableSessionState="true" />
    <httpModules>
      <remove name="Session" />
      <add name="Session" type="System.Web.SessionState.SessionStateModule" />
    </httpModules>
  </system.web>
</configuration>

Please help me