Windows User Login - Three attempt

I have tried with session flag till three times but in second time hit with
wrong password in the following code got into the lock. 

Dim oDE As DirectoryEntry = New DirectoryEntry("GC://DomainName",
UserName, Password, AuthenticationTypes.Secure)

While increment the session count till two Im redirected to the Login page. 
While third attempt with correct user name and password will go to lock that
implies in second attempt with wrong password while hit the Directory Entry that
user account got lock. Hence I got login page for third attempt but above things
is problem.
Can you tell me what can I do for third attempt?