string str = a.ToString();
str = Regex.Replace(str, @"</?span[^>]*>", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"&#[^>]*;", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?marquee[^>]*>", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?object[^>]*>", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?param[^>]*>", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?embed[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?table[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @" ","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?tr[^>]*>", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?th[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?p[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?a[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?img[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?tbody[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?li[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?span[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?div[^>]*>","",RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?th[^>]*>", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?td[^>]*>", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"</?script[^>]*>", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"(javascript|jscript|vbscript|vbs):", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"on(mouse|exit|error|click|key)", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"<\\?xml[^>]*>", "", RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"<\/?[a-z]+:[^>]*>", "", RegexOptions.Ignore
最早使用的Frontpage和后来经常使用的Dreamweaver，现在已经很少使用了，而Adobe也已经收购了macromedia。有是有需要编辑一些简单的HTML文件，还是一些免费的轻量级的编辑器。
下面是我找到的一些，给需要的朋友们：
http://www.softpedia.com/get/Internet/WEB-Design/HTML-Editors/
http://www.skycn.com/sort/s ......
