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....one: public static void Add_TextBox () { using var pres = new Presentation...with border and no text) var textBox = pres . Slides [ 0 ]. Shapes...