title: the authType parameter in CredentialCache.Add Method
body: <p>what is the authType in CredentialCache.Add Method ? 
  <a href="http://msdn.microsoft.com/en-us/library/czdw7s9e.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/czdw7s9e.aspx</a>
  I do not understand what should I pass to it based on the uRi that I am passing to this Add method.  and my uRi is actually an asmx page address</p>