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....)-> PutValue ( 2 ); /*set formula*/ cells -> GetObjectByIndex...String ( "=SUM(A1,A2)" )); /*formula calculation*/ wb -> CalculateFormula...