Sending and receiving data from web service in winform

Sending and receiving data from web service in winform

I wrote a WinForm application which should use a Web service to retrieve
needed information. the address is this :
I read some articles here and in msdn and also added service reference to
my project but when I want to use the methods I can't.
Now I've got confused. I need to send username and password to service and
after authenticating send an ID and the web service sends back the
appropriate information then I need to send back the log of what I've
received. Is it possible through WinForm ? How can I do it?
Some sample code or reference would be appriciatted.