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Introduction to Revit 2011 API
DB Element
Element.Parameter and Built-In Parameters 
§There are four ways to access individual parameters: 
§Parameter(BuiltInParameter) – retrieve a parameter using the parameter Id.
§Parameter(String) – retrieve using the name.
§Parameter(Definition) – retrieve from its definition.
§Parameter(GUID) – retrieve shared parameter using GUID.
§
§RevitLookup tool comes handy to explore and find out which BuiltInParameter corresponds to which parameter name
DB Element RevitLookup Param definition.PNG
Here we’ll look at the first and second.