Understand from this guide how and when - as well as when not - to use multithreading.
Latest Threading Articles
Using the Task Parallel Library and PLINQ to Go Parallel
With more and more computers using a multi-core processor, the free lunch of increased clock speeds and the inherent performance gains are over. Software developers must instead make sure their applications take use of all the cores available in an efficient manner. New features in .NET 4.0 mean that managed code developers too can join the party.
Safe Multithreading with the BackgroundWorker Component
Until the .NET Framework controls are thread safe, you will have to use Control.Invoke and delegates to marshal data from background worker threads to the Windows Form thread.
Batched Execution Using the .NET Thread Pool
The .NET thread pool's functionality for executing multiple tasks sequentially in a wave or group is insufficient. Luckily, a Visual C++.NET helper method that uses other types within the System.Threading namespace provides this batch-execution model.
Attributes
C# provides a mechanism for defining declarative tags, called attributes, which you can place on certain entities in your source code to specify additional information. The information that attributes contain can be retrieved at run time through reflection. You can use or you can define your own custom attributes.
Changing the Default Limit of 25 Threads of the ThreadPool Class
It should be a simple function call to change the default thread limit of 25 threads of the ThreadPool class per processor. But, it's not that easy at all. Learn the way to do this.
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MFC Integration with the Windows Transactional File System (TxF)
The Transactional File System (TxF), which allows access to an NTFS file system to be conducted in a transacted manner through extensions to the Windows SDK API. MFC 10, has been extended to support TxF and related technologies. This support allows existing MFC applications to be easily extended to support kernel transactions.

Entity Framework Code First Simplicity
Looking to quickly get started with Code First in .NET, but don't have the time to read and digest all the tutorials that are available out there? Peter Shaw shows you the quickest, simplest way to get started with Code First Entity Framework (EF).

Exploiting the MonthCalendar Control with Visual Basic
Hannes du Preez explains all (well, most) of the little secrets of MonthCalendar, a control that enables calendar-like capabilities and that looks like a visual representation of a month.
Working with State Machines in the .NET Framework
Arun Karthick introduces you to the state machine model and shows you how to create a simple working state machine sample using the .NET framework in the C# language.