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....first worksheet Worksheet worksheet = workbook . Worksheets [ 0...A2 worksheet . Cells [ "A1" ]. PutValue ( 10 ); worksheet . Cells...