How can I export data to an Excel file

MS provides the OpenXML SDK V 2.5 – see https://msdn.microsoft.com/en-us/library/bb448854(v=office.15).aspx

This can read+write MS Office files (including Excel)…

Another option see http://www.codeproject.com/KB/office/OpenXML.aspx

IF you need more like rendering, formulas etc. then there are different commercial libraries like Aspose and Flexcel…

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