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Can't cancel user request during file upload.

Hello all!
I'm trying to create a kind of code which checks size of file being uploaded and if size exceeds a particular value it should cancel upload and redirect to a page containing error description. In Application_BeginRequest function of global.asax I simply check value of Request.ContentLength and try to redirect if it's bigger than expected by calling the Response.Redirect method. But then I'm getting an "Access is denied" javascript error in IE (in FireFox it just says that "connection to remote host is lost"). Could you please help me to find a solution? This error is making me crazy!
void Application_BeginRequest(object sender, EventArgs e)
		HttpApplication app = sender as HttpApplication;
		if (app.Request.ContentLength > 10000)

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ASP.NETWeb Applications

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8/22/2022 - Mon

That's some weird syntax there "HttpApplication app = sender as HttpApplication;"  Have you tried just simply using "Application" as your variable, in replacement of "app"?  

on the note of what you're really trying to accomplish, I helped an expert over a year ago come to the conclusion that this just can't be done,

Perhaps things have changed, or you can find a better method?

Raterus, yes I've tried using this.Request and it didn't help. Besides, looks like "this" and "sender" reference to the same Application instance.
If it's not possible to cancel the request then how do other proprietary and free upload controls accomplish this task? For example, see NeatUpload control (http://www.brettle.com/neatupload#Download) - it allows you to cancel file upload at any moment. But I didn't understand how it works as I'm only a beginner in this sphere.

I wish I could tell you how those work too, my guess is they are going through a different chain of events than the standard <input type="file" /> but I don't know, sorry.
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Oops. I found that made a syntax error in code and that's why my handler had not been called. Now it works, so my solution works!