Article ID: 895474
Article Last Modified on 12/3/2007
APPLIES TO
- Microsoft .NET Framework 1.1
- Microsoft .NET Framework 1.1 Service Pack 1
SYMPTOMS
Memory and resources are not released when you call the Form.Close method on child multiple-document interface (MDI) forms in an MDI Microsoft Windows Forms application. This problem occurs on a computer that has the Microsoft .NET Framework 1.1 or the Microsoft .NET Framework 1.1 with Service Pack 1 (SP1) installed.
This behavior is contrary to the Microsoft Developer Network (MSDN) documentation for the Form.Close method. The MSDN documentation for the Form.Close method states that all resources that are created within the form are closed and the form is disposed when you call the Form.Close method.
CAUSE
This problem occurs when the child MDI forms have been created, but the Form.Show method has not been called to display the forms.
RESOLUTION
Software update 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:
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 software update, 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 software update.
Software update replacement information
This software update does not replace any other software updates.
File information
The English version of this software update 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 ---------------------------------------------------------------------- 10-Mar-2005 20:09 1.1.4322.2304 2,056,192 System.windows.forms.dll
WORKAROUND
To work around this problem, call the Form.Dispose method on each child MDI form that you want to close.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
MORE INFORMATION
For more information about the Form.Close method, visit the following MSDN Web site:
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.Close MDI child forms memory
Keywords: kbwinserv2003sp2fix kbqfe kbhotfixserver kbframe kbnmeet301sp2fix kbnetframe110presp2fix kbbug kbfix KB895474
