Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive.

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C#5.0

Hi,
I am making 3 more web applications in c#.Net in office. But one of the web application shows the following error.

Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive. Please also make sure that System.Web.SessionStateModule or a custom session state module is included in the <configuration>\<system.web>\<httpmodules> section in the application configuration.

I create one separate web application and copy the necessary coding part only. Then also i get the same error message. I searched in net also but i cannot solve this issue.
Can anybody give the solution for this? Thanks in advance.

In my web application i have 5 web application forms in that one is login page. The 3 web pages works fine when i do some process on that forms, but in the remaining one form also works fine but when i click the upload button the datas upload and the message displayed in javascript coding also. After i click ok in javascript, the Session["Username"] is become null and the page redirect to login page. This is the my actual problem.