private void UpdateHeadersFooters(RadDocument document)
{
    foreach (Section section in document.Sections)
    {
        if (section.Headers.Default.Body != null)
        {
            this.UpdateFields(section.Headers.Default.Body);
        }
 
        if (section.Headers.First.Body != null)
        {
            this.UpdateFields(section.Headers.First.Body);
        }
 
        if (section.Headers.Even.Body != null)
        {
            this.UpdateFields(section.Headers.Even.Body);
        }
 
        if (section.Footers.Default.Body != null)
        {
            this.UpdateFields(section.Footers.Default.Body);
        }
 
        if (section.Footers.First.Body != null)
        {
            this.UpdateFields(section.Footers.First.Body);
        }
 
        if (section.Footers.Even.Body != null)
        {
            this.UpdateFields(section.Footers.Even.Body);
        }
    }
}
 
private void UpdateFields(RadDocument radDocument)
{
    RadDocumentEditor editor = new RadDocumentEditor(radDocument);
    editor.ChangeAllFieldsDisplayMode(FieldDisplayMode.Code);
}