Microsoft KB Archive/943508

= FIX: You may experience high memory usage when you try to send large attachments in a Web Services Enhancements 3.0-based application =

Article ID: 943508

Article Last Modified on 10/31/2007

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APPLIES TO


 * Web Services Enhancements 3.0 for Microsoft .Net

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SYMPTOMS
When you try to send large attachments in a Microsoft Web Services Enhancements (WSE) 3.0-based application, you may experience high memory usage. Additionally, an OutOfMemoryException exception may occur.



CAUSE
This problem occurs because WSE 3.0 buffers the attachments before the attachments are sent. If the attachments are large, the buffers are correspondingly large. The large buffers may cause high memory usage. However, you cannot stream the Message Transmission Optimization Mechanism (MTOM) attachments without buffering in WSE 3.0.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer 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.

To stream the MTOM attachments before the MTOM attachments are sent from the client computer to the Web server, you must apply this hotfix. Then, you must set the SendChunkWithoutBuffering boolean property to the true value in the WSE Web service proxy class.

To stream the MTOM attachments before the MTOM attachments are sent from the Web server to the client computer, you must use a custom class that implements the IXmlSerializable interface. Additionally, you must stream the MTOM attachments by using the WriteXml method.

Prerequisites
No prerequisites are required. You must uninstall all the previously installed WSE 3.0 files.

Restart requirement
You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.

WSE 3.0 Runtime


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
Some sample applications are provided in this hotfix. After you apply this hotfix, you can find the sample applications in the following location:

\Samples\CS\QuickStart\Basic\BinaryDataMTOM

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: MTOM Attachments Streaming WSE 3.0

Keywords: kbfix kbexpertiseadvanced kbpubtypekc kbqfe KB943508

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