how to add header an footer to world document using html

namespace OOXML
{
    using DocumentFormat.OpenXml.Packaging;
    using DocumentFormat.OpenXml.Wordprocessing;

    public class WordProcess
    {
        /// read header and footer strings from html and then call AddHeader
        /// by passing the existing word file

        public void AddHeader(string wordFile, string header, string footer)
        {
            using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(wordFile, true))
            {
                foreach (HeaderPart hp in wordDoc.MainDocumentPart.HeaderParts)
                {
                    // add/modify header values
                    Header h = hp.Header;
                }

                foreach (FooterPart fp in wordDoc.MainDocumentPart.FooterParts)
                {
                    // add/modify footer values
                    Footer f = fp.Footer;
                }
            }
        }
    }
}