Question

Is HttpContext.Current ever null in a web Application (assuming threads are not being used)? More specifically, would it ever be null in void Application_OnError(object sender, EventArgs e)?

Answer 1

see this other question

Session is not initialized until the AcquireRequestState event, so any error occurring before this point will not have session variables available.

I think the same applies to HttpContext.Current as HttpContext.Current.Session

So yes, I think HttpContext.Current can sometimes be null in Application_OnError