Getting started with OpenXML
In this article, we are trying to draw a basic map to programmatically manipulate xlsx files using Office Xml library. Many applications require working with excel files, either for reading and importing data from it, or for exporting data into reports, so it is important to know how to programmatically manipulate excel files. Since 2007, Excel files have completely changed their internal structure. Xls was a proprietary binary file format, whereas xlsx is an Xml Based-format, called Office Open Xml (OOXML).