In Micros. VisStudio 2005 C++: when I gcnew an object should I then free it somehow?

In Micros. VisStudio 2005 C++: when I gcnew an object should I then free it somehow?
I guess the garbage collector will do that job for me but what if I wanna explicitely free the object when not needed so that there is not much job left for the garbage collector??

thank you

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