If its more than 5-10 parameters, then create an object that takes the parameters instead, it could be a typed dataset, structure or whatever.
Instead of :
Mywebservice.CreateUser(Firstname, LastName, Age,Sex, Haircolor,AmountOfFingers,AmountOfTeeht,Childrens,,,,,,,,,,,,,and so on)
Do:
Dim MyUser as new UserObject
MyUser.Firstname="Stefan"
...and so on...
MyWebservice.CreateUser(UserObject)
