Log-In Screen / Dont Validate?

So I am creating a log-in screen that is similar to that of Facebook's. In other words you can log-in but if you are a new user you can create yourself a profile quickly by filling in a few fields.

The problem I have is I want to put validators in to check that a user has completed all the necessary fields but the validators dont validate even if the user is not using that form. For example, if I filled in the create user form and pressed the create user button the page would not progress as the validators for the log-in section would say that there is no text in the username or password fields.

I was wondering if there is a way of fixing this. I thought that maybe you could write in the VB code something like:

IF btnCreateUser_Click = True

then

the required validators for the log-in section are set to true.