In my application I added my own membership provider and wrote
<membership defaultProvider="SecurityTutorialSqlMembershipProvider">
<providers>
<clear/>
<add name="SecurityTutorialSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="SecurityTutorialsConnectionString" enablePasswordRetrieval="false" requiresQuestionAndAnswer="true" applicationName="SecurityTutorial4" requiresUniqueEmail="true" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="7" passwordAttemptWindow="10" passwo ...
Go to the complete details ...