Turning on anonymous capabilities personalization properties : Anonymous Profiles « Profile « ASP.NET Tutorial

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3. Anonymous Profiles

<configuration>
  <system.web>
     <profile>
        <properties>
           
           <add name="FirstName" type="System.String" />
           <add name="LastName" type="System.String" />
           <add name="LastVisited" type="System.DateTime" allowAnonymous="true" />
           <add name="Age" type="System.Integer" />
           <add name="Member" type="System.Boolean" />
           
        </properties>    
     </profile>
    <authentication mode="Windows" />
  </system.web>
</configuration>