i'm trying to run this query from my .net code and i'm getting 403 Forbidden message, this was working fro me last month i tested it.

 WebClient cleint = new WebClient();
            cleint.BaseAddress = "http://en.wikipedia.org/";
            string url = @"w/api.php?action=query&list=categorymembers&cmtitle=Category:Physics";
            string htmlCode = cleint.DownloadString(url);    //This is where i get the Exception.

Any Idea Guys?

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