How to use Web Service Task with 2 methods

Hi All,

I am using Web Service Task to call the web service which includes 2 methods, one is the login method that needs the account and password, the other one is about  collecting the data.

However, when I use Web Service Task to call that webservices, it just supports only one method one Web Service Task.

If I use two Web Service Tasks to do it, the first one uses login method, the other one uses collecting the data method.

Then the second one always fails, because it didn't get the right validation because of this task cannot login.

How to put 2 methods into one Web Service Task?

Thanks.