This blog shows on how Idisposable is used for.
Idisposable is of
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The primary use of this interface is to release
unmanaged resources. The garbage collector automatically releases the memory
allocated to a managed object when that object is no longer used.
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However, it is not possible to predict when
garbage collection will occur.
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Furthermore, the garbage collector has no
knowledge of unmanaged resources such as window handles, or open files and
streams.
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The consumer of an object can call this method
when the object is no longer needed.