adding a footer to the page in an HttpModule

I could use late events such as EndRequest开发者_StackOverflow中文版 and put inside Response.Write but this way whatever I'm adding would come after the /html tag and the HTML won't be well formed.

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Very bad practice to use the HttpModule for page footer. This can lead to possible errors with UpdatePanels, and possible with other controls on randomly pages - especial if you try to add controls.

Also its probably delay the load of all pages and eat a lot of memory reading the page and append at the end strings on every single request.

Use a master page !. Its very simple and the correct way.

More to read: Creating a Layout Using Master Pages