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Besides using OpenXML
to create comments on PowerPoint slides, we can also utilize 3rd-party library to accomplish this task. This sample shows how to use the classes in the Spire.Presentation 2.0 to  add a comment on a PowerPoint slide programmatically
using C#.
Since Microsoft has released its 2007 office pack, compatibility matters between old versions’ files and 2007 programs has been reported. This sample focuses on delivering a solution to convert Excel files from XLS to XLSX or from XLSX to XLS via a .NET Eexcl component-Spire.XLS.
If you created a pretty Excel table and now want to publish it online as a web page, the simplest way is to export it to an old good HTML file. This sample is aimed to deliver a C# solution to convert Excel to HTML with its original layout.
This sample shows how to convert image  to PDF using a free .NET PDF component in C#.
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