Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....Workbook (); Worksheet worksheet = newWorkbook . Worksheets . Add (..."New Sheet" ); Cells cells = worksheet . Cells ; cells [ 0 , 0 ]...