Internally GC Frees the memory means The objects which are 
not used from long time onwords it delets the objects and 
frees the memory to place the new objects which are going 
to be used.

The main objective of GC is Memory Management....
Gc wil take initiative when ever the application meemory is 
low...we hav Finalize() method which runs implicitly...and 
Dispose() method which we hav to kal Explicity....

Gc identifies the unused objects with reference counting 
concept.
Finalize() method runs implicitly and free the resources if 
the object havin no references...in the case of Dispose() 
method it wont mind if the reference r ther.....

Gc maintain 4 Generation...start with 0 ..ends with 3
if GC released the resources using 
Finalize method() still u can get the object..coz dis 
method havin backup...it stores in generation0-3