Public Class myOwnMembershipProvider
Inherits SqlMembershipProvider

Public Overrides Function ChangePassword(ByVal username As String, ByVal oldPassword As String, ByVal newPassword As String) As Boolean

If check_new_pw_recurrence(newPassword) Then
  Throw New ArgumentException(SR.GetString("Password_already_used", _
                New Object() {"newPassword", 10}))
End If

Return MyBase.ChangePassword(username, oldPassword, newPassword)
End Function

Private Function check_new_pw_recurrence(ByVal newPassword As String) As Boolean
'todo check if password was not used the last 10 times
Return True
End Function

End Class