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POWhat is the difference between AntiXss.HtmlEncode and HttpUtility.HtmlEncode?
 

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  1. POWhat is the difference between AntiXss.HtmlEncode and HttpUtility.HtmlEncode?
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    <p>I just ran across a question with an answer suggesting the AntiXss library to avoid cross site scripting. Sounded interesting, reading the <a href="http://msdn.microsoft.com/en-us/library/aa973813.aspx" rel="noreferrer">msdn blog</a>, it appears to just provide an HtmlEncode() method. But I already use HttpUtility.HtmlEncode().</p> <p><strong>Why would I want to use AntiXss.HtmlEncode over HttpUtility.HtmlEncode?</strong></p> <p>Indeed, I am not the first to ask this question. And, indeed, Google turns up <a href="http://blogs.msdn.com/dansellers/archive/2006/02/23/538187.aspx" rel="noreferrer">some</a> <a href="http://blogs.msdn.com/securitytools/archive/2009/07/09/differences-between-antixss-htmlencode-and-httputility-htmlencode-methods.aspx" rel="noreferrer">answers</a>, mainly</p> <ul> <li>A white-list instead of black-list approach</li> <li>A 0.1ms performance improvement</li> </ul> <p>Well, that's nice, but what does it mean for me? I don't care so much about the performance of 0.1ms and I don't really feel like downloading and adding another library dependency for functionality that I already have.</p> <p><strong>Are there examples of cases where the AntiXss implementation would prevent an attack that the HttpUtility implementation would not?</strong></p> <p>If I continue to use the HttpUtility implementation, am I at risk? What about <a href="http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=252514" rel="noreferrer">this 'bug'</a>?</p>
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