Create a new Form element by thickening a single-surface form, and add it into the Autodesk Revit family document. 
   Namespace:   Autodesk.Revit.Creation  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- isSolid
 -  Type:  System Boolean  
Indicates if the Form is Solid or Void. 
- singleSurfaceForm
 -  Type:  Autodesk.Revit.DB Form  
The single-surface form element. It can have one top/bottom face or one side face. 
- thickenDir
 -  Type:  Autodesk.Revit.DB XYZ  
The offset of capped solid.