Sets or returns a protection level for the document. Possible values are: None, TrackChanges, Comments, Forms, and ReadOnly.

public ProtectionLevel DocumentProtected{ get; set; }

Public Property DocumentProtected() As ProtectionLevel

          //--- Get ProtectionLevel
          DocumentProtection.ProtectionLevel level = docProtect.DocumentProtected;

          //--- Set ProtectionLevel to allow editing of Forms only
          docProtect.DocumentProtected = DocumentProtection.ProtectionLevel.Comments;
        

          '--- Get ProtectionLevel
          Dim level As DocumentProtection.ProtectionLevel = docProtect.DocumentProtected

          '--- Set ProtectionLevel to allow editing of Forms only
          docProtect.DocumentProtected = DocumentProtection.ProtectionLevel.Comments