Specifies whether the .NET object represents a valid Revit entity. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Return Value
True if the API object holds a valid Revit native object, false otherwise.Remarks
 If the corresponding Revit native object is destroyed, or creation of the corresponding object is undone, a managed API object containing it is no longer valid. API methods cannot be called on invalidated wrapper objects.