Create new Form element by swept blend operation, 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. 
- path
 -  Type:  Autodesk.Revit.DB ReferenceArray  
The path of the swept blend. The path should be 2D, where all input curves lie in one plane. If there's more than one profile, the path should be a single curve. It's required to reference existing geometry. 
- profiles
 -  Type:  Autodesk.Revit.DB ReferenceArrayArray  
The profile set of the newly created swept blend. Each profile should consist of only one curve loop. Each profile must be in a plane that intersects with the path and is perpendicular to the path at the point of intersection.