The exception that is thrown when an I/O error occurs. 
   Namespace:   Autodesk.Revit.Exceptions  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Inheritance Hierarchy
  System Object  
System Exception
Autodesk.Revit.Exceptions ApplicationException
Autodesk.Revit.Exceptions IOException
Autodesk.Revit.Exceptions DirectoryNotFoundException
Autodesk.Revit.Exceptions FileAccessException
Autodesk.Revit.Exceptions FileNotFoundException
Autodesk.Revit.Exceptions InvalidDataStreamException
 
 System Exception
Autodesk.Revit.Exceptions ApplicationException
Autodesk.Revit.Exceptions IOException
Autodesk.Revit.Exceptions DirectoryNotFoundException
Autodesk.Revit.Exceptions FileAccessException
Autodesk.Revit.Exceptions FileNotFoundException
Autodesk.Revit.Exceptions InvalidDataStreamException