public string GetHtml(Tk5FieldInfoEx field, IFieldValueProvider provider, bool needId)
        {
            TkDebug.AssertArgumentNull(field, "field", this);

            string startHtml = field.EasySearch(provider, true);
            string endHtml   = HtmlCommonExtension.EasySearchEnd(field, provider);

            return(HtmlCommonUtil.GetRangeCtrl(startHtml, endHtml));
        }