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FIX: Errors may occur when you use the BinaryFormatter class or the SoapFormatter class to serialize an object in the .NET Framework 1.1

When you use the BinaryFormatter class or the SoapFormatter class to serialize an object in the Microsoft .NET Framework 1.1, errors may occur. The errors occur when the previously serialized object is deserialized.
This problem occurs because serialization preserves the object layout in a specific order. When the same object is deserialized, the changes to the object layout and to the order of the objects may cause errors to occur.

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: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 apply this hotfix, you must have the .NET Framework 1.1 Service Pack 1 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   ----------------------------------------------------------   25-Mar-2005  23:34  1.1.4322.2310  2,138,112  Mscorlib.dll        31-Mar-2005  02:37                    10,916  Mscorlib.ldo   29-Mar-2005  18:48  1.1.4322.2310  2,519,040  Mscorsvr.dll        29-Mar-2005  18:48  1.1.4322.2310  2,506,752  Mscorwks.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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
serialize BinaryFormatter SOAP deserialize

Article ID: 893251 - Last Review: 09/28/2011 16:17:00 - Revision: 3.0

  • Microsoft .NET Framework 1.1
  • Microsoft .NET Framework 1.1 Service Pack 1
  • kbwinserv2003sp2fix kbqfe kbhotfixserver kbfix kbbug KB893251