C# 借助类名获取Div之间的字符串

HTML是：

<div class="topheader-left common-txt" style="color: #ffffff;vertical-align:top;padding-top:3px">
            &nbsp;Sunday,&nbsp; April&nbsp;&nbsp;28,&nbsp;2013&nbsp;|&nbsp;08:07:07 PM
        </div>

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配置了HTML敏捷包。现在代码是什么

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我希望使用专门构建的HTML解析器（如配置的（XPath）或（jQuery选择器语法）HTML Agility Pack）可以更轻松地实现这一点。现在代码是什么。

HtmlElementCollection theElementCollection = default(HtmlElementCollection);
                theElementCollection = webBrowser1.Document.GetElementsByTagName("div");
                foreach (HtmlElement curElement in theElementCollection)
                {
                   if (curElement.GetAttribute("class").ToString() == "topheader-left common-txt")
                    {
                        MessageBox.Show(curElement.GetAttribute("InnerText"));

                    }
                }

HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(html);

var innerText = doc.DocumentNode
                   .SelectSingleNode("//div[@class='topheader-left common-txt']")
                   .InnerText;


DateTime time = DateTime.ParseExact(WebUtility.HtmlDecode(innerText).Split('|')[1].Trim(), 
                                    "hh:mm:ss tt",
                                    CultureInfo.InvariantCulture);