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....SetBackgroundPicture ( "e:\\test\\school.jpg" ); //Save the excel...path. string ImageUrl = @"e:\test\school.jpg" ; //Get the picture...