FamilySymbol of the annotation to use for this connection type. 
Namespace: Autodesk.Revit.DB.Structure
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2011 
Syntax
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Parameters
- familySymbolId
 - Type: Autodesk.Revit.DBElementId
 
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.ExceptionsArgumentException | 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.ExceptionsArgumentNullException | A non-optional argument was null |