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 , 2 ] = "Product Name" ; //Add data... Cells [ 2 , 1 ] = 1 ; sheet . Cells [ 3 , 1 ] = 2 ; sheet ....