Web Services User Token

Hi all,

I am currently write a code to consume a webservice. I am performing a
task which will take quite a long time. After 10 hours, it throws an
exception "The user token has expired". When I contacted support, they
told me that I would have to re-authenticate and get a new token. Can
someone give me an example code snippet to do this? I am using VB.NET.

Thanks,
Vijay