An issue as PDFNET-50625 has been logged in our issue tracking system for the sake of further investigation. We will look into its details and keep you posted with the status of its rectification. Please be patient and spare u some time.
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A
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We are sorry for the inconvenience.
We have investigated the earlier logged ticket. For rotated pages you have to set annotation Rotate property matching of value Page.Rotate for right annotation orientation.
Follow code will add annotation as you expect:
transform = pdfDocument.Pages[1].RotationMatrix.Transform(new Aspose.Pdf.Rectangle(200, 400, 400, 600));
FreeTextAnnotation freetext = new FreeTextAnnotation(pdfDocument.Pages[1], transform, default_appearance);
freetext.Rotate = Rotation.on270; //If pdfDocument.Pages[1].Rotate = Rotation.on270
freetext.Contents = "Free Text - @ " + pdfDocument.Pages[1].Rotate;
pdfDocument.Pages[1].Annotations.Add(freetext);
Important note - You have to set up Rotate property of annotation before Contents to get an effect.