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Postback causes 100=Continue, causes double download prompt?

Xavier Osa
Posts: n/a

I have an ASP.Net web page that you can download a file. As
Fergunson's problem, it prompts twice dialog boxes only if I select
Open button. If I select Save button, it prompts once.

I'm using W2000KS & IE6 sp1 & VS.NET 2003.

If I change method="post" by method="get" form attribute, it works

If I reproduce the problem as Mike Moore, I have the same problem,
two dialog boxes.

is it possible to solve the problem with post?

Thank You
Javier Osa

| >From: "" <(E-Mail Removed)>
| >Subject: Postback causes 100=Continue, causes double download
| >Date: Wed, 2 Apr 2003 22:59:26 -0500
| >Lines: 41
| >X-Priority: 3
| >X-MSMail-Priority: Normal
| >X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
| >X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
| >Message-ID: <ugc7xVZ#(E-Mail Removed)>
| >Newsgroups: microsoft.public.dotnet.framework.aspnet
| >NNTP-Posting-Host:
| >Path:
cpmsftngxa08.phx.gbl!cpmsftngxa06.phx.gbl!TK2MSFTN GP08.phx.gbl!TK2MSFTNGP11.
| >Xref: cpmsftngxa08.phx.gbl
| >X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| >
| >I have an ASP.Net form running under W2K Server SP3. It either
shows a
| >regular page, or if selected will instead download an excel
| >
| >It prompts twice. But only if I'm doing a postback. If I call the
| >code without a postback it does not.
| >
| >I looked at the network traffic with a sniffer, and the key
difference I see
| >is that the one with the postback is sending a response first with
| >status=100 (continue), and then with the document and status=OK.
| >
| >The continue is supposed to be essentially a "do nothing", but I
| >(emphasis on think) this is causing the double promtp for
save/open. Again,
| >same browser same code but without being in a postback state it
does not
| >prompt twice.
| >
| >Here's a bit of code from page_load that actually sends the
| >
| >Response.Clear()
| >Response.ContentType = "application/"
| >Response.AppendHeader("content-disposition", "attachment;
| >filename=YourOutput.xls")
| >Response.WriteFile(sTargetFile)
| >Response.End()
| >Response.Close()
| >
| >The sTargetFile is a real Excel file (xls). There is no difference
in the
| >code I wrote whether it's called with a postback or not (I'm sure
there is
| >differences under the covers).
| >
| >Note that both mechanisms work. The one that prompts twice is just
| >annoying. Both prompts are identical - same file name, application
| >etc.
| >
| >I'm not sure which is the more relevant question - what causes the
| >100=continue? Or how can I prevent it from causing a double
| >
| >Linwood
| >
| >PS. Internet Explorer 6 SP1.
| >
| >
| >
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