Материал из .Net Framework эксперт
Modifying the membership provider in web.config
<configuration>
<system.web>
<membership>
<providers>
<clear />
<add name="AspNetSqlMembershipProvider"
type="System.Web.Security.SqlMembershipProvider, System.Web,Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
connectionStringName="LocalSqlServer"
requiresQuestionAndAnswer="false"
requiresUniqueEmail="true"
passwordFormat="Hashed"
minRequiredNonalphanumericCharacters="0"
minRequiredPasswordLength="3" />
</providers>
</membership>
</system.web>
</configuration>