The load orientation option. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0) 
  Since:  2015 
Syntax
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Remarks
 For hosted load only LoadOrientTo.Project and LoadOrientTo.HostLocalCoordinateSystem are permitted. For non-hosted load only LoadOrientTo.Project and LoadOrientTo.WorkPlane are permitted. To determine if load is hosted use  IsHosted  property. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | When setting this property: orientTo is not permitted for this type of load. | 
| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | When setting this property: A value passed for an enumeration argument is not a member of that enumeration |