I've inserted some text into a Word document using the
wordApplication.Selection.InsertXML() method.  Then I've added headers and
footers as follows (this.document is the active document):

HeaderFooter header =
this.document.Sections.First.Headers[WdHeaderFooterIndex.wdHeaderFooterFirstPage];
HeaderFooter footer =
this.document.Sections.First.Footers[WdHeaderFooterIndex.wdHeaderFooterFirstPage];

// Clear any text in there.
header.Range.Delete(ref missing, ref missing);
footer.Range.Delete(ref missing, ref missing);

// Insert header and footer.
header.Range.InsertXML(this.resourceManager.GetString("HeaderXml",
CultureInfo.CurrentCulture), ref dummy);
footer.Range.InsertXML(this.resourceManager.GetString("FooterXml",
CultureInfo.CurrentCulture), ref dummy);

// Ensure different header and footer on first page.
this.document.Content.PageSetup.DifferentFirstPageHeaderFooter = -1;
// Ensure header is visible.
this.document.ActiveWindow.View.SeekView = WdSeekView.wdSeekFirstPageHeader;
this.document.ActiveWindow.View.SeekView = WdSeekView.wdSeekMainDocument;

Now, the HeaderXML and footerXML strings simply contain a <w:tbl> element.

In some circumstances, after I've inserted the main text into the document,
Word adds a section break of its own (continuous).

Whilst this still displays everything ok, Word does not save properly.  If I
save the document in XML format (no transforms, etc), the header and footer
is not saved out.  However, if I save the same document in Word Document
(DOC) format, the header and footer is saved out.

Also, if Word does not add a section break of its own when I insert the text
into the main document, the header and footer is saved in both XML and DOC
format.

It seems that for some reason the code I have for inserting headers and
footers causes them not to be saved out if and only if, Word inserts its own
section breaks when I insert text.

Can someone please help as I have to sort this ASAP?

Thanks.

Haydn