httpwebresponse the remote server returned an error 401 unauthorized

Does the URL you are trying to consume require authentication? Have you setup credentials for your HttpRequest?

And also:
I've checked your previous questions. If the experts answer your question, It will be better to accept the correct answer(s), otherwise the question will stay as unaswered in the site. Accepting the correct answer is also a bare "thank you" to the expert who is helping you. It seems you are not disposed toward accepting. I keep wondering about you can't find your answer here, but you are asking again and again?!(!) ;)
You can accept the correct answer by clicking on the green button.

Need a lot more details.