Impersonation and NetworkCredential

Question

I need to pass a NetworkCredential object with the credentials of the currently impersonated user to a web service from an asp.net application.
My code look

Answer 1

A somewhat lengthy article in MSDN explaining the options to obtain network credentials in ASP:

How To: Use Impersonation and Delegation in ASP.NET 2.0

Another blog article on the topic (though I didn't check whether the solution actually works:

.NET (C#) Impersonation with Network Credentials

Answer 2

It's not possible to use the asp.net impersonated user (Current.User.Identity) for network authentication, it only works locally.