How can i stop validation checking on login control in ASP.NET

Question

I have used a login control in my master page and i have created a registration page which inherits that master page.My Problem is that when i clicked on submit button for checking validation on registration page ,it also shows error message which was given by me to check validation for login control.
Can anyone tell me, how can i stop validation checking on login control when any user is registring themselves using registration page?