Creates a new parameter binding between a parameter and a set of categories in a specified group. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- key
-  Type:  Autodesk.Revit.DB Definition  
 A parameter definition which can be an existing definition or one from a shared parameters file.
- item
-  Type:  Autodesk.Revit.DB Binding  
 An InstanceBinding or TypeBinding object which contains the set of categories to which the parameter should be bound.
- parameterGroup
-  Type:  Autodesk.Revit.DB BuiltInParameterGroup  
 The GroupID of the parameter definition.
Remarks
 Note the type of the binding object dictates whether the parameter is bound to all instances or just types. A parameter definition cannot be bound to both instances and types. If the Parameter binding already exists, post an error and return false