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    Important to note that the DLL for this is just over 5 MB and limited to Office 2007 formats. But certainly the easiest and fastest solution which works for me.
    – Josh Brown
    Commented Sep 20, 2011 at 13:03
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    Just a heads up that v2.5 is out and can be downloaded here.
    – Snuffleupagus
    Commented Jan 4, 2013 at 16:47
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    The SDK models the XML into classes, so that each XML tag is mapped to a tag, and then you have to build the class hierarchy (each instance has a collection of child instances/tags) correctly. This means you have to know the XML structure of an Excel file, which is very complicated. It's much easier to use a wrapper such as EPPlus, mentioned above, which simplifies things.
    – Tsahi Asher
    Commented Dec 24, 2014 at 16:27
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    A great sample of Microsoft Open XML SDK - Open XML Writer can be found at polymathprogrammer.com/2012/08/06/… Or see Stack Overflow solution stackoverflow.com/questions/11370672/…
    – Greg
    Commented Feb 17, 2017 at 17:51
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    I found Microsoft Open XML SDK's Open XML Writer to be great. Using the solutions above, (Especially Vincent Tom's sample (Poly Math)), it's easy to build a writer that streams through big sets of data, and writes records in a manner similiar and not too much more complex to what you'd do for CSV; but that you're instead writing xml. Open XML is the mindset that Microsoft considers it's new Office formats in. And you can always rename them from .xslx to .zip files if you feel like poking at their XML contents.
    – Greg
    Commented Feb 17, 2017 at 17:54