winforms-richedit-table-of-contents-practical-guide/CS/Form1.cs#L93

Field field = Document.Fields.Create(Document.Paragraphs[(insertHeading ? 1 : 0)].Range.Start, "TOC " + switches);
CharacterProperties cp = Document.BeginUpdateCharacters(field.Range);
cp.Bold = false;

winforms-richedit-document-api/CS/RichEditAPISample/CodeExamples/Export.cs#L88

    exportOptions.FieldResultEndMarker = "]";
    plainText = document.GetText(item.Range, exportOptions);
}

word-processing-table-of-contents-practical-guide/CS/Program.cs#L125

Field field = document.Fields.Create(document.Paragraphs[(insertHeading ? 1 : 0)].Range.Start, "TOC " + switches);
CharacterProperties cp = document.BeginUpdateCharacters(field.Range);
cp.Bold = false;

winforms-richedit-table-of-contents-practical-guide/VB/Form1.vb#L85

Dim field As Field = Document.Fields.Create(Document.Paragraphs(If(insertHeading, 1, 0)).Range.Start, "TOC " & switches)
Dim cp As CharacterProperties = Document.BeginUpdateCharacters(field.Range)
cp.Bold = False

winforms-richedit-document-api/VB/RichEditAPISample/CodeExamples/Export.vb#L78

    exportOptions.FieldResultEndMarker = "]"
    plainText = document.GetText(item.Range, exportOptions)
End If

word-processing-table-of-contents-practical-guide/VB/Program.vb#L122

Dim field As Field = document.Fields.Create(document.Paragraphs(If(insertHeading, 1, 0)).Range.Start, "TOC " & switches)
Dim cp As CharacterProperties = document.BeginUpdateCharacters(field.Range)
cp.Bold = False