which event handler should you write the code?

You create a Web Form. The Web Form allows users to log on to an application. You include a Login control named Login1 on the Web Form. You need to write code in one of Login1’s event handlers. This code must implement your custom logic that validates the user’s credentials. In which event handler should you write the code?

A.
Login1_LoggingIn

B.
Login1_LoginError

C.
Login1_Authenticate

D.
Login1_LoggedIn

E.
Login1_Load