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WebRequest Url Not Returning Correct Page Source If Proxynull Not Used As Part Of Url Query String (Web Scraping) In C#

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In one of the sites im crawling, I encountered a situation where
a site needs a query string like proxynull = 90B69303-3A61-4482-AF0725FDA1DAE548 or appended into a url like this http://samplesite/bin/jobs_list.cfm?proxynull=90B69303-3A61-4482-AF0725FDA1DAE548

I wonder if i could just use the post data and use the url without the proxynull query string like this http://samplesite/bin/jobs_list.cfm to scrape the website.

After series of experimentation, the solution is to set the webproxy of the webrequest object to default proxy similar to the code below: 
((HttpWebRequest)webRequest).Proxy = WebRequest.DefaultWebProxy;
in order to use the url(http://samplesite/bin/jobs_list.cfm) without proxynull.

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