从线程单线程单元线程中声明资源/内存

I am using following single threaded appartment. I am unable to reclaim memory/other resources from thread object. Actullay I want to wrap my thread in try catch and fianlly block. try and catch are done. But I am unsure about finally block. What code, property or function do I need to call in finally block.I am using following single threaded appartment