This document contains class names in namespace format, such as Autodesk.Revit.DB.Element. In C++/CLI Autodesk.Revit.Element is Autodesk::Revit::DB::Element. Since only C# is used for sample code in this manual, the default namespace is Autodesk.Revit.DB. If you want to see code in Visual Basic, you will find several VB.NET applications in the SDK Samples directory.
Some Revit Platform API class properties are "indexed", or described as overloaded in the API help file (RevitAPI.chm). For example, the Document.Element property has two overloads. In the text of this document, these are referred to as properties, although you access them as if they were methods in C# code by pre-pending the property name with "get_" or "set_". For example, to use the Document.Element(String) property overload, you use Document.get_Element(String).