How can I set an A4 document in landscape (horizontal) format in iTextSharp?
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You can set the page size to a rotated A4. E.g. (assuming PDF, but should apply regardless):
iTextSharp.text.Document doc;
// ...initialize 'doc'...
// Set the page size
doc.SetPageSize(iTextSharp.text.PageSize.A4.Rotate());
I've done this with PDF without trouble, haven't tried it with other doc types.

T.J. Crowder
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Crowder, Sir. I also want to change the `PDF` to `landscape mode` will the above code work ??? – Nad Oct 03 '15 at 12:50
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3What is funny is that doc.SetPageSize(PageSize.A4_LANDSCAPE) does not work, but the answer works. – Timores May 25 '16 at 15:33
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You can initialize a new document like that:
Document doc = new Document(iTextSharp.text.PageSize.A4.Rotate(), 10, 10, 10, 10);
In this mode all pages will be in landscape mode.
To change the layout of the page inside the document you can use:
doc.SetPageSize(iTextSharp.text.PageSize.A4); // for vertical layout
doc.SetPageSize(iTextSharp.text.PageSize.A4.Rotate()); // for horizontal layout

Allan Pereira
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Alexei Bondarev
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