How to determine if .NET code is running in an ASP.NET process?
.net, asp.net, c#
Solution
HttpContext.Current can also be null within ASP.NET if you're using asynchronous methods, as the asynchronous task happens in a new thread that doesn't share the HttpContext of the original thread. This may or may not be what you want, but if not then I believe that HttpRuntime.AppDomainAppId will be non-null anywhere in an ASP.NET process and null elsewhere.
Problem
I have an instance of a general purpose class that will be executed both under ASP.NET and a stand alone program. This code is sensative to the process where it is being run - that is, there are certin methods that should not called if running under ASP.NET. How do you determine if the code is executing in an ASP.NET process? The solution I am currently using is answered below. I wish someone would add a comment as to why this question has gotten downvoted and/or propose a better way to ask it! I can only assume at least some folks have looked at the question and said "what an idiot, ASP.NET code is .NET code".