Document doc = new Document(MyDir + "Remove section breaks.docx");
// Loop through all sections starting from the section that precedes the last one
for (int i = doc.Sections.Count - 2; i >= 0; i--)
{
// Copy the content of the current section to the beginning of the last section.
doc.LastSection.PrependContent(doc.Sections[i]);
// Remove the copied section.
doc.Sections[i].Remove();
}

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public void RemoveSectionBreaksFeature()
{
	using (WordprocessingDocument myDoc = WordprocessingDocument.Open(MyDir + "Remove section breaks.docx", true))
	{
		MainDocumentPart mainPart = myDoc.MainDocumentPart;
		List<ParagraphProperties> paraProps = mainPart.Document.Descendants<ParagraphProperties>()
			.Where(IsSectionProps).ToList();
		foreach (ParagraphProperties pPr in paraProps)
			pPr.RemoveChild(pPr.GetFirstChild<SectionProperties>());
		using (Stream stream = File.Create(ArtifactsDir + "Remove section breaks - OpenXML.docx"))
		{
			mainPart.Document.Save(stream);
		}
	}
}
private static bool IsSectionProps(ParagraphProperties pPr)
{
	SectionProperties sectPr = pPr.GetFirstChild<SectionProperties>();
	if (sectPr == null)
		return false;
		return true;
}

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