ULONG AddRef();
Increases the object's reference count by 1.
·Returns the new reference count.
When the object is created, its reference count is set to 1. Every time an application obtains an interface to the object or calls the AddRef method, the object's reference count is increased by 1. Use the Release method to decrease the object's reference count by 1.
This method is part of the IUnknown interface inherited by the object.