Microsoft KB Archive/821387

= FIX: The Aspnet_wp.exe process may stop responding when you use the Response.BinaryWrite method to download large files from an ASP.NET page =

Article ID: 821387

Article Last Modified on 10/25/2005

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APPLIES TO


 * Microsoft Visual Studio .NET 2002 Enterprise Architect
 * Microsoft Visual Studio .NET 2002 Enterprise Developer
 * Microsoft Visual Studio .NET 2002 Professional Edition
 * Microsoft ASP.NET 1.0

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For a Microsoft .NET Framework 1.1 version of this article, see 823409.



SYMPTOMS
When you use the Response.BinaryWrite method to download files that are 400 MB or larger from an ASP.NET page, the Aspnet_wp.exe process may stop responding (crash). You may see the following event logged in the application log of the Event Viewer:

Source: ASP.NET 1.0.3705.0

Event Category: None

Event ID: 1000

Date: 5/16/2002

Time: 11:01:11 AM

User: N/A

Computer: 

Description: Aspnet_wp.exe (PID: 9999) stopped unexpectedly.



CAUSE
In this scenario, the following things occur:
 * 1) The code typically causes the download box to appear.
 * 2) The Inetinfo.exe process starts to heavily exhaust memory.
 * 3) Private Bytes in Inetinfo.exe increase until you run out of virtual memory.
 * 4) When you run out of virtual memory, you experience an unexpected recycle of the Aspnet_wp.exe process. (Private Bytes in Aspnet_wp.exe are not affected; the number of Aspnet_wp.exe Private Bytes does not significantly increase.)
 * 5) Inetinfo.exe does not release the memory until the download is complete (or canceled).

Note If you perform simultaneous downloads, you may compound the problem.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next .NET Framework 1.0 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version       Size       File name --  28-May-2003  00:47  1.0.3705.429    200,704  Aspnet_isapi.dll 28-May-2003 00:42                    4,169  Aspnet_perf.h   28-May-2003  00:47                  513,302  Aspnet_perf.ini 28-May-2003 00:47                  510,714  Aspnet_perf2.ini 28-May-2003 00:47  1.0.3705.429     28,672  Aspnet_rc.dll 28-May-2003 00:47  1.0.3705.429     24,576  Aspnet_regiis.exe 28-May-2003 00:47  1.0.3705.429     28,672  Aspnet_wp.exe 27-May-2003 23:55  1.0.3705.429     69,632  Corperfmonext.dll 27-May-2003 23:53  1.0.3705.429    303,104  Mscorjit.dll 28-May-2003 11:59  1.0.3705.429  1,953,792  Mscorlib.dll 27-May-2003 23:46                   10,284  Mscorlib.ldo 27-May-2003 23:54  1.0.3705.429  2,269,184  Mscorsvr.dll 27-May-2003 23:53  1.0.3705.429  2,269,184  Mscorwks.dll 01-Aug-2002 21:38                       15  Smartnav.htm 17-Oct-2002 17:55                    8,728  Smartnav.js   28-May-2003  12:01  1.0.3705.429  1,196,032  System.Web.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
This hotfix adds another function to the Response object (Response.TransmitFile). You can use the function instead of the BinaryWrite function or instead of other functions that are used to send files to the client. Also, you can use this function regardless of the size of the file that you want to transmit. To test this new functionality, paste the following code in an empty ASPX page after you download and install the hotfix. You must change the &quot;c:\\repro\\z.zip&quot; line in the code to reflect a path and ZIP file that exist on a computer.  void Page_Load { Response.ContentType=&quot;application/x-zip-compressed&quot;; Response.AddHeader(&quot;Content-Disposition&quot;, &quot;attachment;filename=z.zip&quot;); Response.TransmitFile(&quot;c:\\repro\\z.zip&quot;); }

Keywords: kbbug kbfix kbqfe kbcodesnippet kbnetframe100presp3fix kbvs2002sp1sweep kbhotfixserver KB821387

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