Change or Replace Header and footer

OpenXML SDK

using System;
using System.Collections.Generic;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;

namespace OpenXML_SDK
{
    class Program
    {
        static void Main(string[] args)
        {
            string path = "Change or Replace Header and footer.docx";
            ChangeHeader(path);
        }

        public static void ChangeHeader(String documentPath)
        {
            // Replace header in target document with header of source document.
            using (WordprocessingDocument document = WordprocessingDocument.Open(documentPath, true))
            {
                // Get the main document part
                MainDocumentPart mainDocumentPart = document.MainDocumentPart;

                // Delete the existing header and footer parts
                mainDocumentPart.DeleteParts(mainDocumentPart.HeaderParts);
                mainDocumentPart.DeleteParts(mainDocumentPart.FooterParts);

                // Create a new header and footer part
                HeaderPart headerPart = mainDocumentPart.AddNewPart<HeaderPart>();
                FooterPart footerPart = mainDocumentPart.AddNewPart<FooterPart>();

                // Get Id of the headerPart and footer parts
                string headerPartId = mainDocumentPart.GetIdOfPart(headerPart);
                string footerPartId = mainDocumentPart.GetIdOfPart(footerPart);

                GenerateHeaderPartContent(headerPart);

                GenerateFooterPartContent(footerPart);

                // Get SectionProperties and Replace HeaderReference and FooterRefernce with new Id
                IEnumerable<SectionProperties> sections = mainDocumentPart.Document.Body.Elements<SectionProperties>();

                foreach (var section in sections)
                {
                    // Delete existing references to headers and footers
                    section.RemoveAllChildren<HeaderReference>();
                    section.RemoveAllChildren<FooterReference>();

                    // Create the new header and footer reference node
                    section.PrependChild<HeaderReference>(new HeaderReference() { Id = headerPartId });
                    section.PrependChild<FooterReference>(new FooterReference() { Id = footerPartId });
                }
            }
        }


        public static void GenerateHeaderPartContent(HeaderPart part)
        {
            Header header1 = new Header() { MCAttributes = new MarkupCompatibilityAttributes() { Ignorable = "w14 wp14" } };
            header1.AddNamespaceDeclaration("wpc", "http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas");
            header1.AddNamespaceDeclaration("mc", "http://schemas.openxmlformats.org/markup-compatibility/2006");
            header1.AddNamespaceDeclaration("o", "urn:schemas-microsoft-com:office:office");
            header1.AddNamespaceDeclaration("r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships");
            header1.AddNamespaceDeclaration("m", "http://schemas.openxmlformats.org/officeDocument/2006/math");
            header1.AddNamespaceDeclaration("v", "urn:schemas-microsoft-com:vml");
            header1.AddNamespaceDeclaration("wp14", "http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing");
            header1.AddNamespaceDeclaration("wp", "http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing");
            header1.AddNamespaceDeclaration("w10", "urn:schemas-microsoft-com:office:word");
            header1.AddNamespaceDeclaration("w", "http://schemas.openxmlformats.org/wordprocessingml/2006/main");
            header1.AddNamespaceDeclaration("w14", "http://schemas.microsoft.com/office/word/2010/wordml");
            header1.AddNamespaceDeclaration("wpg", "http://schemas.microsoft.com/office/word/2010/wordprocessingGroup");
            header1.AddNamespaceDeclaration("wpi", "http://schemas.microsoft.com/office/word/2010/wordprocessingInk");
            header1.AddNamespaceDeclaration("wne", "http://schemas.microsoft.com/office/word/2006/wordml");
            header1.AddNamespaceDeclaration("wps", "http://schemas.microsoft.com/office/word/2010/wordprocessingShape");

            Paragraph paragraph1 = new Paragraph() { RsidParagraphAddition = "00164C17", RsidRunAdditionDefault = "00164C17" };

            ParagraphProperties paragraphProperties1 = new ParagraphProperties();
            ParagraphStyleId paragraphStyleId1 = new ParagraphStyleId() { Val = "Header" };

            paragraphProperties1.Append(paragraphStyleId1);

            Run run1 = new Run();
            Text text1 = new Text();
            text1.Text = "Header";

            run1.Append(text1);

            paragraph1.Append(paragraphProperties1);
            paragraph1.Append(run1);

            header1.Append(paragraph1);

            part.Header = header1;
        }

        public static void GenerateFooterPartContent(FooterPart part)
        {
            Footer footer1 = new Footer() { MCAttributes = new MarkupCompatibilityAttributes() { Ignorable = "w14 wp14" } };
            footer1.AddNamespaceDeclaration("wpc", "http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas");
            footer1.AddNamespaceDeclaration("mc", "http://schemas.openxmlformats.org/markup-compatibility/2006");
            footer1.AddNamespaceDeclaration("o", "urn:schemas-microsoft-com:office:office");
            footer1.AddNamespaceDeclaration("r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships");
            footer1.AddNamespaceDeclaration("m", "http://schemas.openxmlformats.org/officeDocument/2006/math");
            footer1.AddNamespaceDeclaration("v", "urn:schemas-microsoft-com:vml");
            footer1.AddNamespaceDeclaration("wp14", "http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing");
            footer1.AddNamespaceDeclaration("wp", "http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing");
            footer1.AddNamespaceDeclaration("w10", "urn:schemas-microsoft-com:office:word");
            footer1.AddNamespaceDeclaration("w", "http://schemas.openxmlformats.org/wordprocessingml/2006/main");
            footer1.AddNamespaceDeclaration("w14", "http://schemas.microsoft.com/office/word/2010/wordml");
            footer1.AddNamespaceDeclaration("wpg", "http://schemas.microsoft.com/office/word/2010/wordprocessingGroup");
            footer1.AddNamespaceDeclaration("wpi", "http://schemas.microsoft.com/office/word/2010/wordprocessingInk");
            footer1.AddNamespaceDeclaration("wne", "http://schemas.microsoft.com/office/word/2006/wordml");
            footer1.AddNamespaceDeclaration("wps", "http://schemas.microsoft.com/office/word/2010/wordprocessingShape");

            Paragraph paragraph1 = new Paragraph() { RsidParagraphAddition = "00164C17", RsidRunAdditionDefault = "00164C17" };

            ParagraphProperties paragraphProperties1 = new ParagraphProperties();
            ParagraphStyleId paragraphStyleId1 = new ParagraphStyleId() { Val = "Footer" };

            paragraphProperties1.Append(paragraphStyleId1);

            Run run1 = new Run();
            Text text1 = new Text();
            text1.Text = "Footer";

            run1.Append(text1);

            paragraph1.Append(paragraphProperties1);
            paragraph1.Append(run1);

            footer1.Append(paragraph1);

            part.Footer = footer1;
        }
    }
}

Aspose.Words

using Aspose.Words;

namespace Aspose_Word
{
    class Program
    {
        static void Main(string[] args)
        {
            string path = "Change or Replace Header and footer.docx";
            ChangeHeader(path);

        }
        public static void ChangeHeader(string documentPath)
        {
            Document doc = new Document(documentPath);
            DocumentBuilder builder = new DocumentBuilder(doc);

            // --- Create header ---
            builder.MoveToHeaderFooter(HeaderFooterType.HeaderPrimary);

            // Specify header title for the first page.
            builder.Write("Aspose.Words Header");

            // --- Create footer for pages other than first. ---
            builder.MoveToHeaderFooter(HeaderFooterType.FooterPrimary);

            // Specify Footer text.
            builder.Write("Aspose.Words Footer");

            // Save the resulting document.
            doc.Save(documentPath);
        }
    }
}

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• Sample Code