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.... Worksheets [ 0 ]; // Add column headings in cell A1 and B1...Cells [ 0 , 0 ]. PutValue ( "Column A" ); sheet . Cells [ 0 , 1...