The sense of the turn. The Turn property must be set to Left or Right on each internal vertex before the RebarShapeDefinitionBySegments is used. Default is permissible for the first and last vertex, since they do not correspond to bends. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | When setting this property: turn must be Left or Right. | 
| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | When setting this property: A value passed for an enumeration argument is not a member of that enumeration |