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"The remote name could not be resolved" on WebRequests

I'm getting this error:

System.Net.WebException: The remote name could not be resolved: 'www.microsoft.com'
   at System.Net.HttpWebRequest.GetResponse()

on any kind of WebRequest, such as:

            WebRequest req2 = WebRequest.Create("http://www.microsoft.com");
            WebResponse res2 = req2.GetResponse();

            FtpWebRequest req = (FtpWebRequest)WebRequest.Create("ftp://" + host );
            req.Method = WebRequestMethods.Ftp.ListDirectory;
            req.Credentials = new NetworkCredential(username, password);
            req.KeepAlive = false;
            req.UseBinary = true;
            req.UsePassive = false;
            req.CachePolicy = new RequestCachePolicy(RequestCacheLevel.BypassCache);
            res = (FtpWebResponse)req.GetResponse();

I can reach these hosts via browser or command line.   There is no proxy server.  My Windows Firewall is disabled and my Kaspersky Internet Security software is turned off.  This USED TO WORK YESTERDAY!!  The only thing i did was upgrade from Visual Studio 2008 Express to Pro.  I re-opened up the project in Express and it still fails.  I suspect the install changed permissions or restrictions.  Are there xml files in my project i need to edit?  I don't know much about dot net.  I'm a Java guy.

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1 Solution
thumkyAuthor Commented:
By the way no firewall changes.  I'm the only one w/ the password.
thumkyAuthor Commented:
AHA!!  I found an exe i compiled before my upgrade.  It ran perfectly!  So its not the network, its the new Visual Studio environment.

Any thoughts?
thumkyAuthor Commented:
this is .NET Framwork 2.0.  I'm going to rebuild the project from scratch
thumkyAuthor Commented:
I rebuilt from scratch and now its okay.  I'll assign points to anyone who can help me learn something constructive from this...
( other than 'when you have a problem w/ Microsoft you need to continually reboot and rebuild until it works!' )
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