Custom MembershipProvider password validation

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C#

ASP.NET

membership

I have a custom MembershipProvider based on this example[^] from msdn.

I defined the minRequiredPasswordLength and minRequiredNonAlphanumericCharacters in my web.config like this:

<membership defaultProvider="CustomMembershipProvider">
  <providers>
    <clear/>
    <add name="CustomMembershipProvider"
         type="CustomProviders.CustomMembershipProvider"
         connectionStringName="CustomDB"
         enablePasswordRetrieval="false"
         enablePasswordReset="true"
         requiresQuestionAndAnswer="false"
         writeExceptionsToEventLog="true"
         requiresUniqueEmail="false"
         passwordFormat="Hashed"
         minRequiredPasswordLength="8"
         minRequiredNonAlphanumericCharacters="2"
         maxInvalidPasswordAttempts="5"
         passwordAttemptWindow="10"
         />
  </providers>
</membership>

But when I try to change the password of the current user using the ChangePassword control or when I create a new user using the CreateUserWizard control, the Membership does not perform any validation over the new password, this means, both controls allow me introduce a new password like abc.

Does the Membership validate automatically the password?
I need to hand-code the password validation methods or there are something wrong with my code?