FamilySymbol of the annotation to use for this connection type. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2011 
Syntax
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Parameters
- familySymbolId
 -  Type:  Autodesk.Revit.DB ElementId  
 
Remarks
 The FamilySymbol must be of category "Connection Symbols" (OST_StructConnectionSymbols) and have its "Apply To" parameter set to match the applyTo property. 
 Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions ArgumentException | Thrown when familySymbolId is the id of some element that is not a FamilySymbol, is not of the category "Connection Symbols" (OST_StructConnectionSymbols), or has its "Apply To" parameter not equal to this type's applyTo property. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null |