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....pie chart, defining the data range and chart title. Saving spreadsheet...Interop . Excel . Range chartRange = sheet . get_Range ( "A2" , "B4"...