ThreadPool.QueueUserWorkItem NullReferenceException

Why I'm getting this error. My variables get the names from request, and also i tried "data.qext" but visual studio give me error.

I got "test.pdf" file in my WebsiteRoot/uploads/files/test.pdf, but still there is an error. Maybe I'm missing something?

Check image for detailed description:


You can try this method instead of HttpContext.Current.Server.MapPath:


Doing so, there's no need for an HttpContext.

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Dropping a session upon page load

php session

I have a checkout system I created. Whenever someone has submitted their order I take them to another page that thanks them for their order and gives them a brief summary of what they ordered. It is