Id of the category that drives the default naming scheme for the assembly instance. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2012 
Syntax
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | When setting this property: This naming category was not valid for an assembly instance containing the proposed members. The naming category should match one of the member element categories. | 
| Autodesk.Revit.Exceptions ArgumentNullException | When setting this property: A non-optional argument was null |