How can I see if my Dispose() is doing anything?

I have a class that runs some queries to the database and stores the queries in datasets, i am implementing the iDisposable and I call the .Dispose() after I am done with the class. Now my question is.. how do I know what performance or what memory was freed due to me doing the .Dispose() vs. me not doing the .Dispose()? I want to know what exactly are the performance and memory difference when I do it vs. when I don't do it.
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