Get a collection of valid placement types for input family symbol. 
   Namespace:   Autodesk.Revit.UI  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2017 
Syntax
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Parameters
- familySymbol
-  Type:  Autodesk.Revit.DB FamilySymbol  
 The family symbol.
- pDBView
-  Type:  Autodesk.Revit.DB View  
 The view in which the family instance will be placed in.
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null |