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....= new FileStream ( MyDir + "Row and Column Operation.xls" , FileMode...Worksheets [ 0 ]; //Inserting a row into the worksheet at 3rd position...