DocumentTopMostContainerParentId Property

Top-most container in the parent/child hierarchy, if any, that contains this document. A document can be contained in a container that itself is contained in a container (and so on). This property returns the DocGuid of the top-most container, if any, in the hierarchy that contains this document. This property returns null if this document does not have a container parent.

[DataMemberAttribute]
public string TopMostContainerParentId { get; set; }