Most CLR objects can be expressed as XAML elements (with the exception of abstract base classes and some other nonabstract base classes used strictly for inheritance purposes in the CLR).
XAML elements are mapped to classes; attributes are mapped to properties or events. At runtime when a XAML element is processed, the default constructor for its underlying class is called, and the object is instantiated; its properties and events are set based on the attribute values specified in XAML.
Resources are a keyed collection of reusable objects. Resources can be created and retrieved using both XAML and C#. Resources can be anything — data templates, arrays of strings, or brushes used to color the background of text boxes. Resources are also scoped, meaning they can be available to the entire Application (global), to the Window, to the User Control, or even to only a specific control.
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