WebHtmlEditor™ lets end users enter special characters that are uncommon on most keyboards by selecting them from a list without having to know their esoteric encoding. WebHtmlEditor handles the translation into "character entity references" The WebHtmlEditor control provides a starter list containing some common special characters. Your application can add to this list.
In the example code below, you will add the Greek letter sigma (S), to the SpecialCharacterList property so your end users receive the Special Characters drop-down list shown above.
In the Page_Load event handler of your Web form, add an HTML character entity reference for the special character that you want to be available in the Special Characters Toolbar drop-down list.
In Visual Basic:
Me.WebHtmlEditor1.SpecialCharacterList.Add("Σ")
In C#:
this.WebHtmlEditor1.SpecialCharacterList.Add("Σ");