si devi settarlo dal webconfig...
codice:
<add connectionStringName="LocalSqlServer" enablePasswordRetrieval="true"
commandTimeout="90" enablePasswordReset="true" requiresQuestionAndAnswer="false"
applicationName="/" requiresUniqueEmail="true" passwordFormat="Encrypted"
maxInvalidPasswordAttempts="5" minRequiredPasswordLength="5"
minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10"
passwordStrengthRegularExpression="" name="AspNetSqlMembershipProvider"
type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7fgdg1d50a3a" />