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.... Cells [ 1 , 1 ] = "Product ID" ; sheet . Cells [ 1 , 2 ] =...0 , 0 ]. PutValue ( "Product ID" ); sheet . Cells [ 0 , 1 ]....