Ban HTML comments from your pages and views
Too many people don’t realize that there are other options than <!-- --> comments to annotate HTML. These comments are harmful because they are sent to the client and thus make your page heavier than it needs to be. When doing ASP.NET, a simple drop-in replacement is server comments, which are delimited by <%-- --%> instead of <!-- -->. Those server comments are visible in your source code, but will never be rendered to the client. Here’s a simple way to sanitize a web site. From Visual Studio, hit CTRL+H to bring the search and replace dialog. Choose “Replace in Files” from the second menu on top of the dialog. Open the find options, check “use” and make sure “Regular expressions” are selected. Use “*.aspx;*.ascx;” as the
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Read the complete post at http://weblogs.asp.net/bleroy/archive/2010/04/02/ban-html-comments-from-your-pages-and-views.aspx