Apartment Threading (STA): This allows multiple threads to 
exist in a single application. In single threading 
apartment (STA), each thread is isolated in it?s own 
apartment. The process may contain multiple threads 
(apartments) however when an object is created in a thread 
(i.e. apartment) it stays within that apartment. If any 
communication needs to occur between different threads 
(i.e. different apartments) then we must marshal the first 
thread object to the second thread.