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I have to download a file from an http server only if the date is changed

if i insert in a request

request = HttpWebRequest.CreateHttp("http://myserver.....");
request.Headers["If-Modified-Since"] = previousValue;

receive errors

in a Windows phone 8 it is possible?

Thank you

John Brush
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    What error do you get? –  Aug 09 '13 at 13:53
  • check out the answer on this question: http://stackoverflow.com/questions/17976587/set-or-read-date-in-http-header-windows-phone-8 – lhan Aug 09 '13 at 14:53

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