is there a (.net-)library for creating PowerPoint-Presentations (PPTX => OpenXML). For creating Excel-sheets I like ClosedXML-Library and would love something similar for PowerPoint. I can't and don't want to use Microsoft Interop because it is an ASP.NET Web-App.
Does someone has any experiences creating PowerPoint-Slides in ASP.NET?
P.S.: I had a look at Aspose but found it little to expensive.
You mentioned OpenXML but have you tried the OpenXML SDK?
Download from: http://www.microsoft.com/download/en/details.aspx?id=5124