Hi

Another question about Sessions in webservices

I have read, that usin Sessions in a webservice is a bad design?
Lets explain my scenario;

1) Client is a .NET WinForms application(for public libraries)
2) Server - ASP.NET WebServices, SQL

a) Client logs into library -  here i must store library ID and other
ID's(patron id aso.) for future use.
   When using Sessions is bad idea how and where to store library ID?
When i store it on client side, i must use it in every method when i call a
webservice!
For example i have method GetAllLoans()
When libray ID is stored serve side, i can only call GetAllLoans() and i get
back dataset.
When library ID is stored on client side, i muse call GetAllLoans(libID)

Also, i think, when ID is stored server side, its much easyer to build other
business logic and queryes
where those ID's are needed!?

Hope you understand me :)

Best regards;

Mex