How to fix "Session state can only be used when enableSessionState is set to true"?

[Bintu yadav]

Genrating 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 have set EnableSessionState="True" in page directy and also in web.config file
basicaly i am using an http module for URLWriting. Error genrating in user control on page load event in which i have checking session["user"] Like
if (Session["User"]==null) condition.
Please help me.

[Plater]

Go to IIS administration, select your website/application and go to properties and set the sessionstate settings in there.

[Lorphelin]

Unfortunately, this message "Session state can only be used..." is NOT ALWAYS APPROPRIATE i.e. it can be displayed even if your "EnableSessionState" setting is positive { by the way, the shortest setting Works!}
Then, never forget the most stupid things: - The Interval Life time of "Session".
If you use Global.asax file in your site :
- Methods Session_Start() and Session_End() will delimit the "Session" variable life time.
NOTE: Avoid usage of Server.Transfer() inside Global.asax:
this might lead to unexpected results.