Thread: HttpException - Session State not enabled.

I've got a head scratcher. In my master page I have:
if (Session.IsNewSession) ....

In two of my pages that are content pages of the master, I'm now getting an HttpException -- Session state can only be used when enableSessionState is set to true... The other 10 or so content page work fine. In no place in the application do I have EnableSessioState="false".

Even after the exception is thrown, I can navigate back to one of the other working pages, and everything seems fine and dandy -- until I attempt to load one of broken pages.

I'm at a total loss as to how to shoot this bug. Anybody have a clue as to how I can determine when SessionState is being disabled?

[Edit] The offending line of code in the Page_Load event.[/edit]

Have you tried setting EnableSessionState="true" in the page directive of those content pages to see if it will work then?

Nope, but I'll put that idea into my bag-o-tricks today.

Thanks goodness for SCM's. The problem pages were ones that I had only made a minor change to; it was simple to go back to the most recent working version and my problem was solved.

We use a product from DevPartners to do an automated source code review prior to going QA. It flagged about 1200 lines of my code as problems (way more than 50% being in source files created by Visual Studio. The Designer.cs files being the worst offenders). Once of the 'suggestions' it made was to change:

Code:

<asp:HiddenField ID="hfACTIVE_CD" Value='<%# Bind("ACTIVE_CD") %>' runat="server" />
//to
<asp:HiddenField ID="hfACTIVE_CD" Value='<%# Server.HtmlEncode(Bind("ACTIVE_CD")) %>' runat="server" />

Actually it suggested Server.HTMLEncode, so I was a bit suspicious and only change it in two places rather than the 100's of places that I bind.

Since this was the only line of code I changed in this file, I removed the Server.HtmlEncode and solved the problem. Since the HtmlException was so far removed from the problem line, it took me a bit to suspect this change.