Create a new StructuralConnectionType, allowing the specified annotation FamilySymbol to be applied to structural members. 
   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
- doc
 -  Type:  Autodesk.Revit.DB Document  
 
- applyTo
 -  Type:  Autodesk.Revit.DB.Structure StructuralConnectionApplyTo  
Specify which type of member this connection type can be applied to. 
- name
 -  Type:  System String  
A name for the connection type. It must be unique within the document. 
- familySymbolId
 -  Type:  Autodesk.Revit.DB ElementId  
The id of an annotation FamilySymbol. InvalidElementId is allowed. Otherwise, the FamilySymbol must be in the category "Connection Symbols" (OST_StructConnectionSymbols) and have its "Apply To" parameter set to match the applyTo argument. 
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | 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 applyTo. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null | 
| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | A value passed for an enumeration argument is not a member of that enumeration |