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Regenerating Page numbers within the document

We have merged multiple documents into one using bookmark and we now like to reset the page number to start from #1 for each page that starts where there is a specific bookmark.

Thanks for your request. You can use RestartPageNumbering. Please see the following code:

// Open document and create DocumentBuilder
Document doc = new Document(@"Test004\in.doc");
DocumentBuilder builder = new DocumentBuilder(doc);
// move documentBuilder cursor to the bookmark
// Insert section break
// restart page numbering
builder.CurrentSection.PageSetup.RestartPageNumbering = true;
// Save output document

If your bookmark is placed at the beginning of the section then you can remove highlighted line from the code.
Hope this helps.
Best regards.