The force vector applied to the start point of the line load, oriented according to OrientTo setting. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2016 
Syntax
Remarks
 The default force unit is kN/m for metric, and kip/ft for imperial. Use UnitUtils class methods to convert value from or to internal units. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | When setting this property: A non-optional argument was null |