Change HTML content by implementing Control.Render() prevents UpdatePanel from working.

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UpdatePanel

I came across 1 situation that I've found a solution yet. Here's the problem:

I override Render method in Page object. The purpose is to modify something after HTML is rendered and before it is outputted to UI. It works well with normal ASP. page. However, with UpdateManager on the page, the asynchronous operation doesn't work right because the content rendered by the execution of Ajax has been interfered. That's a problem. I intend to modify the content before it's rendered by UpdateManager but doesn't make a hit.

Does anyone has any clue?

I appreciate your help.