ASP.NET怎么去掉HTML字符串中的HTML标签

ASP.NET如何去掉HTML字符串中的HTML标签
有一段字符串类似“<OL><LI><STRONG>wwwwwww</STRONG><BR>wwwwww<BR><STRONG>wwwwwww</STRONG><BR><STRONG>
”这样的字符串，我想把这段字符串中的所有标签全部去掉，这剩下所有的wwwww，如何实现，大仙们给点指导
[最优解释]

            StreamReader reader = new StreamReader("c:\\temp\\1.txt",Encoding.Default);
            string source = reader.ReadToEnd();
            Regex reg = new Regex(@"(?is)(?<=>)[^<]+(?=<)");
            MatchCollection mc = reg.Matches(source);
            foreach (Match m in mc)
            {
                MessageBox.Show(m.Value);
            }

[其他解释]
http://blog.csdn.net/gulijiang2008/article/details/7190281
[其他解释]
这个用HtmlAgilityPack会非常简单。
[其他解释]

public static string ReplaceHtmlMark(string HtmlString)
        {
            string[] RegexString = {
                                       @"style='.*?'",
                                       @"class='.*?'",
                                       @"<param.*?>(</param>)?",
                                       @"<embed.*?>(</embed>)?",
                                       @"<object.*?>(</object>)?",
                                       @"<strong.*?>(</strong>)?",
                                       @"<span.*?>(</span>)?",
                                       @"<p.*?>(</p>)?", 
 
                                       @"<u.*?>(</u>)?",
                                       @"<em.*?>(</em>)?",
                                       //@"<div.*?>(</div>)?",

                                   };
            foreach (String str in RegexString)
            {
                Regex regex = new Regex(str, RegexOptions.IgnoreCase);
                HtmlString = regex.Replace(HtmlString, string.Empty);
            }
            string[] RegexString2 = {
                                        //@"</div>",
                                        @"</p>",
                                        @"</object>",
                                        @"</strong>",
                                        @"</span>",
                                        @"</ins>",
                                    };
            foreach (String str2 in RegexString2)
            {
                Regex regex2 = new Regex(str2, RegexOptions.IgnoreCase);
                HtmlString = regex2.Replace(HtmlString, string.Empty); 
 
            }
            return HtmlString;
        }

[其他解释]
Refer:
http://www.cnblogs.com/insus/archive/2012/04/25/2470430.html
[其他解释]
System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex(@"<[^>]*>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            string html = regex.Replace(html, ""); 

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