Gets the solid line pattern element id. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Return Value
The element id of the solid line pattern.Remarks
 Note that Solid is special. It isn't a line pattern at all -- it is a special code that tells drawing and export code to use solid lines rather than patterned lines. Solid is visible to the user when selecting line patterns.