Microsoft KB Archive/915040

= FIX: A NullReferenceException exception may occur when you set the Table property of a DataView object in a .NET Framework 2.0 application =

Article ID: 915040

Article Last Modified on 12/3/2007

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APPLIES TO


 * Microsoft .NET Framework 2.0

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SYMPTOMS
Consider the following scenario in a Microsoft .NET Framework 2.0 application:
 * You set a DataTable object for the Table property of a DataView object.
 * The DataTable object that you use contains fewer rows than the DataTable object that was previously set for the Table property.
 * The DataView object is bound to a DataGrid object.

In this scenario, a NullReferenceException exception may occur.



CAUSE
This problem occurs because the DataView object raises a ListChanged event before the DataView object has completed the transition to the new DataTable object. The DataView object tries to access the index for a DataRow object. However, that index is no longer valid because the Table property is set to a different DataTable object.



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 Microsoft .NET Framework 2.0 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.

Prerequisites
You must have the .NET Framework 2.0 installed before you apply this hotfix.

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

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

Download information
To resolve this issue, download the appropriate file for the operating system.

If you are running an x86-based operating system
The following file is available for download from the Microsoft Download Center:

Download the NDP20-KB916002-X86.exe package now.

If you are running an x64-based operating system
The following file is available for download from the Microsoft Download Center:

Download the NDP20-KB916002-X64.exe package now.

If you are running an Itanium architecture-based operating system
The following file is available for download from the Microsoft Download Center:

Download the NDP20-KB916002-IA64.exe package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

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.

Microsoft .NET Framework 2.0, Itanium architecture-based versions


WORKAROUND
To work around this problem, do not update the Table property of the current DataView object. Instead, create a DataView object that contains the DataTable object that you want to bind. After you have created the DataView object, make the DataGrid object refer to the new DataView object.



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 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: DataView DataTable Table .NET 2.0

Keywords: kbbug kbfix kbqfe kbpubtypekc kbhotfixserver KB915040

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