title: Changes in Active Directory in .NET c#
body: <p>I am working on synchronization between internal .NET application  between active directory for all users and groups. I am getting all users and groups from Active Directory and save these data in .NET application database. </p>
  
  <p>I am using <code>PrincipalContext</code> object for Active Directory queries. I want to determine if changing user or group to provide high performance. Is there any way that ; for example <code>LastModifiedDate</code> property for <code>GroupPrincipal</code> or <code>UserPrincipal</code> objects.</p>