Question

I have been using session variables in my asp.net application for passing the next property:

[DefaultValue(true)]
public bool IsModificationMode
{
    get
    {
        return (bool)Session["ModificationMode"];
    }
    set { Session["ModificationMode"] = value; }
}

In the PageLoad, I set it’s value.

Now after the Postback, I am losing it’s value having a a NullReferenceException

Answer 1

I upvoted @stacknewbee because I agree with his idea of the application pool self-recycling. As a solution, try uncoupling the session state from the w3wp.exe process by changing the web.config entry from InProc to StateServer:

<sessionState mode="StateServer" stateConnectionString="tcpip=127.0.0.1:42424" timeout="30"/>

Keep in mind that the server service ASP.Net State Server must be started.