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The remote server returned an error: (500) Internal Server Error (WebCclient) In C#

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In our case when we encountered this error using WebClient, the solution was to set the user agent and add it as header to the WebCclient object.
newWebClient.Headers.Add("user-agent",   
"Mozilla/5.0 (Windows NT 6.1; rv:2.0) Gecko/20100101 Firefox/4.0");

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