using DevExpress.XtraRichEdit;
using DevExpress.XtraRichEdit.API.Native;
using System.Drawing;

void AddNewFootnote(Document document, DocumentPosition footnotePosition, string footnoteText) {
    Note footnote = document.Footnotes.Insert(footnotePosition);
    SubDocument footnoteDocument = footnote.BeginUpdate();
    var footnoteRange = footnoteDocument.AppendText(footnoteText);
    CharacterProperties footnoteCharProps = footnoteDocument.BeginUpdateCharacters(footnoteRange);
    footnoteCharProps.Bold = true;
    footnoteCharProps.ForeColor = Color.Red;
    footnoteDocument.EndUpdateCharacters(footnoteCharProps);
    footnote.EndUpdate(footnoteDocument);
}

void AddNewEndnote(Document document, DocumentPosition endnotePosition, string endnoteText) {
    Note endnote = document.Endnotes.Insert(endnotePosition);
    SubDocument endnoteDocument = endnote.BeginUpdate();
    var endnoteRange = endnoteDocument.AppendText(endnoteText);
    CharacterProperties endnoteCharProps = endnoteDocument.BeginUpdateCharacters(endnoteRange);
    endnoteCharProps.Bold = true;
    endnoteCharProps.ForeColor = Color.Red;
    endnoteDocument.EndUpdateCharacters(endnoteCharProps);
    endnote.EndUpdate(endnoteDocument);
}

void ChangeNoteAppearance(Document document, string noteSeparator, NoteRestartType restartType,
    NumberingFormat format, int startNumber) {
    SubDocument noteSeparatorDoc = document.Footnotes.BeginUpdateSeparator(NoteSeparatorType.Separator);
    noteSeparatorDoc.Delete(noteSeparatorDoc.Range);
    noteSeparatorDoc.AppendText(noteSeparator);
    document.Footnotes.EndUpdateSeparator(noteSeparatorDoc);

    foreach (Section section in document.Sections) {
        FootnoteOptions footnoteOptions = section.FootnoteOptions;
        footnoteOptions.RestartType = restartType;
        footnoteOptions.NumberingFormat = format;
        footnoteOptions.StartNumber = startNumber;
    }
}

void ChangeNotePosition(Document document, EndnotePosition endnotePosition, FootnotePosition footnotePosition) {
    document.EndnotePosition = endnotePosition;

    foreach (Section section in document.Sections)
        section.FootnoteOptions.Position = footnotePosition;
}