MembershipUser.UnlockUser Method ()
Clears the locked-out state of the user so that the membership user can be validated.
Assembly: System.Web.ApplicationServices (in System.Web.ApplicationServices.dll)
This method is not available. This can occur if the application targets the .NET Framework 4 Client Profile. To prevent this exception, override the method, or change the application to target the full version of the .NET Framework.
Users can also be locked out if you use the GetPassword or ResetPassword overload that accepts a password answer and the number of bad answers entered by the user reaches the value of Membership.MaxInvalidPasswordAttempts within the Membership.PasswordAttemptWindow.
Your implementation of this method should set the IsLockedOut property to false, set the LastLockoutDate property to the current date, and reset any counters that you use to track the number of failed log in attempts and so forth.
Available since 2.0