ASP.NET Capture and replace output in Global.asax

I need to replace some data that’s sent from every page on my site, and I think doing it with Global.asax. This is what I have tried with so far:

void Application_PreSendRequestContent(object sender, EventArgs e)
{
    System.IO.StreamReader sr = new System.IO.StreamReader(Response.OutputStream);
    String output = sr.ReadToEnd();

    Response.ClearContent();
    Response.Write("Testing..");
}

But this gives me an ArgumentException. What am I doing wrong? Is there any better way to do this?

Thanks

Answers:

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Method 1

Is there any better way to do this?

A HttpModule might be the better choice for such a task.

For an example on how to modify the response of a request, have a look at this article: Producing XHTML-Compliant Pages With Response Filters.

Method 2

The post Logging raw HTTP request/response in ASP.NET MVC & IIS7 descibes very nicely exactly how to get a copy of the response.

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