Rehandle ASPX Page

I want to know if there is a way to alter开发者_StackOverflow中文版 the markup for an aspx page before it goes to the client. I'm creating a sort of test CMS thing where I am going to use proprietary tags like to denote sections of content that can be edited. Obviously I dont want the tags in the markup once it's sent to the client so I need to remove it before hand. So I want to know if there is a way to catch the page either before or after IIS handles it and change the markup.

Thanks!

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What you need is a HttpHandler.