MSDN

Introduction to Data Concurrency in ADO.NET - http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vbtskPerformingOptimisticConcurrencyChecking.asp

Concurrency Control in ADO.NET - http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vboridataupdatesconcurrency.asp

MSDN Magazine

Tackle Data Concurrency Exceptions Using the DataSet Object - http://msdn.microsoft.com/msdnmag/issues/03/04/DataConcurrency/default.aspx

Data Points – Handling Data Concurrency Using ADO.NET - http://msdn.microsoft.com/msdnmag/issues/04/09/DataPoints/default.aspx

Data Points – Handling Data Concurrency Using ADO.NET, Part 2 - http://msdn.microsoft.com/msdnmag/issues/04/10/DataPoints/default.aspx

Support

Support WebCast: Microsoft ADO.NET Concurrency Using Visual Basic Windows Forms - http://support.microsoft.com/default.aspx?kbid=817281&product=vsnet