Retrieves a parameter from the element given a GUID for a shared parameter. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- guid
-  Type:  System Guid  
 The unique id associated with the shared parameter.
Remarks
 Parameters are a generic form of data storage within elements. The parameters are visible through the Autodesk Revit user interface in the Element Properties dialog. This method is used to retrieve a parameter for a known shared parameter. When a shared parameter is created it is assigned a Guid which will not change. This guid can be used to retrieve the piece of data from the element at a later time.