Do you want to change orientation (e.g. landscape, portrait) of a single or multiple pages in a Word document? GroupDocs.Merger for .NET allows you to do this with just a few lines of code.
Usage
Below are the steps to change page orientation:
- Initialize OrientationOptions class with desired orientation mode and page numbers
- Instantiate Merger objectwith source document path or stream
- Call ChangeOrientation method and pass OrientationOptions object to it
- Call Save method specifying file path to save resultant document
Code Implementation
[gist id=“0e88b7ea17c45581f7d9d70cdaf1cd35” name=““pageorientation.cs]
Have a look at the source DOCX file.

After changing orientation of first page (from portrait to landscape)

We have following helpful resources for you in order to get started:
If you face any API related issue, please post it on forum.