vSphere SDK windows authentication

Hi,

I'm using .NET c# and so far I'm connection to the vCenter in next way:

VimClient client1 = new VimClient();

client1.Connect("https://<hostname>/sdk");

client1.Login("user", "pass");

However, since from vShpere client is possible to use windows authentication I suppose that somehow I can manage to do it from my implementation as well, but I couldn't find how to do it.

Is somebody know how I can do it from the code?

Thank you,

dragon