title: HttpWebRequest.UserAgent : What does it do
body: <p>I read this MSDN like about it and ran its example.
  <a href="http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.useragent.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.useragent.aspx</a></p>
  
  <p>when I change the uSerAgnet to something like "blah", the output is wrong but when I use the same thing that is in the example of even when I comment out the line of code that is setting the UserASgent, the output is correct.</p>
  
  <p>what is UserAgent at all ? when should I set it ? How to know to what value should I set it ?</p>
  
  <p>thanks</p>