title: How to impersonate a user when calling a .NET web service from a SharePoint webpart?
body: <p>What is the best practice for impersonating the current SharePoint user when accessing a web service that uses NTLM authentication?  The webpart has the user name but not password, and apparently, passing the network credential from the webpart does not work.  The remote web service uses NTLM to authorize the user.</p>