Retrieves or changes the material of the category. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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| Visual Basic | 
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Field Value
a null reference ( Nothing in Visual Basic) if this category does not have a material.Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions InvalidOperationException | When setting this property: material cannot be set for annotation categories. |