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BUG: A System.NullReferenceException exception occurs when an instance of a DataSet typed object is serialized when multiple threads access the same instance of a DataSet typed object synchronously

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Microsoft Knowledge Base Article

This article contents is Microsoft Copyrighted material.
©2005-©2007 Microsoft Corporation. All rights reserved. Terms of Use | Trademarks
Article ID: 903645 - Last Review: May 21, 2007 - Revision: 1.4

BUG: A System.NullReferenceException exception occurs when an instance of a DataSet typed object is serialized when multiple threads access the same instance of a DataSet typed object synchronously

View products that this article applies to.

SYMPTOMS

When an instance of a DataSet typed object is serialized when multiple threads are accessing the same instance synchronously, a System.NullReferenceException exception may occur. The typical call stack is similar to the following:
at System.Data.DataTable.System.Runtime.Serialization.ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)

at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter)

at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter)

at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)

at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck)

at System.Runtime.Remoting.Channels.BinaryServerFormatterSink.SerializeResponse(IServerResponseChannelSinkStack sinkStack, IMessage msg, ITransportHeaders& headers, Stream& stream)

at System.Runtime.Remoting.Channels.BinaryServerFormatterSink.ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, IMessage& responseMsg, ITransportHeaders& responseHeaders, Stream& responseStream)
This problem occurs when the DataTable typed object does not have the DataSet member set to an instance of a DataSet typed object
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CAUSE

This problem occurs because the GetObjectData method that serializes a DataTable typed object uses specific methods of the DataSet class. If the DataTable typed object does not have the DataSet member set to an instance of a DataSet typed object, the DataTable typed object will temporarily add or remove the DataSet object. However, the addition or removal of this temporary DataSet object cannot be performed synchronously.
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WORKAROUND

To work around this problem, you can add a DataSet member to the DataTable typed object. The DataSet member is set to an instance of the DataSet typed object. For example, locate the following line of code.
myTable = new DataTable("Names");
Then add the following lines of code after the previous code.
DataSet myDS = new DataSet("MyDataSet");
myDS.Tables.Add(myTable);
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STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.
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REFERENCES

For more information about the DataTable class, visit the following Microsoft Developer Network (MSDN) Web site:
http://msdn2.microsoft.com/en-us/library/system.data.datatable(vs.71).aspx (http://msdn2.microsoft.com/en-us/library/system.data.datatable(vs.71).aspx)
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APPLIES TO
  • Microsoft .NET Framework 1.1
  • Microsoft .NET Framework 1.0
  • Microsoft ADO.NET 1.1
  • Microsoft ADO.NET 1.0
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Keywords: 
kberrmsg kbtshoot kbbug KB903645
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