Microsoft KB Archive/899020

= FIX: A Windows Forms-based application may experience a memory leak when a form within the application is set as the owner of another form in the .NET Framework 1.1 and in the .NET Framework 1.1 with Service Pack 1 =

Article ID: 899020

Article Last Modified on 12/3/2007

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APPLIES TO


 * Microsoft .NET Framework 1.1
 * Microsoft .NET Framework 1.1 Service Pack 1

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SYMPTOMS
In the Microsoft .NET Framework 1.1 and in the Microsoft .NET Framework 1.1 with Service Pack 1 (SP1), a Microsoft Windows Forms-based application may experience a memory leak when the following conditions are true:
 * A form within the application is set as the owner of another form.
 * You use the AddOwnedForm method to assign ownership of one form to another form within the application.



CAUSE
This problem occurs because the owner form holds a reference to the owned form. This prevents the garbage collector from cleaning the owned form even when the owned form is closed and is not being used.



Hotfix information
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 1.1 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.

Prerequisites
To apply this hotfix, you must have the .NET Framework 1.1 SP1 installed on the computer.

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 tool in Control Panel.   Date         Time   Version        Size       File name --  05-May-2005  02:59  1.1.4322.2322  2,056,192  System.windows.forms.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
For more information, 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: Form AddOwnedForm memory leak propertystore

Keywords: kbwinserv2003sp2fix kbprb kbfix kbtshoot kbqfe kbhotfixserver KB899020

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