Thanks for the reply, Mitch. This was only a test to assess ClosedXML's memory usage. Looking at XLAddress, XLRow and XLCell I can see that they do not implement IDisposable, and I cannot see how resources are released. From my tests it seems like they keep holding on to a lot of memory even after the using block is exited. I would be keen to read other members' opinions on this.
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