FamilyParameterGUID Property

public Guid GUID { get; }

Public ReadOnly Property GUID As Guid
	Get

public:
property Guid GUID {
	Guid get ();
}

member GUID : Guid with get

foreach (FamilyParameter familyParam in familyDoc.FamilyManager.Parameters)
{
    string familyParamName = familyParam.Definition.Name;
    try
    {
        Guid guid = familyParam.GUID;
        TaskDialog.Show("Revit",familyParamName + " is shared. Guid is " + guid);
    }
    catch (System.Exception)
    {
        TaskDialog.Show("Revit",familyParamName + " is NOT shared");
    }
}