As far as you need to be concerned as a .NET developer, you can freely interchange them as and when you feel like it.
Latest .NET Framework Classes Articles
Improved COM Interoperability in .NET 4.0
Learn about the COM Interoperability improvements coming with the .NET Framework 4.0 and how they will make your COM Interop such as Office applications much easier.
Creating Responsive .NET Applications with Microsoft Concurrency and Coordination Runtime (CCR)
Discover how CCR can work with the .NET Ping class APM functions.
An ADO.NET Data Services Tutorial
An ADO.NET Data Services Tutorial covering REST, querystring operations and expressions, HTTP verbs, Linq to Data Services, security, exceptions and tracing.
TIP: Closing your WCF Connections properly
This tip looks at properly closing a WCF connection from your application - whether you're using the proxy classes or a ChannelFactory.
New Features in Microsoft Visual Studio 2010 and the .NET Framework 4.0
Learn about several features relevant to developers in Visual Studio 2010 and the .NET Framework 4.0, such as parallel programming, XSLT debugging, new ASP.NET features, and new VB.NET and C# features that include the Chart control, XSD Designer, Lambda Expressions, and optional parameters.
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Comparing the stdio and iostream C++ Libraries
It's essential to know the differences in these libraries and use them correctly. This brief tutorial will guide you.

Reading Stack Overflow Information
The Stack Overflow site has useful tools. Use C# to access them more readily.

Using SQL Common Table Expressions to Improve VB Queries
Using SQL commands through your Visual Basic programming isn't difficult once you understand the basics.

Load Testing: SLA First
Here are some guidelines to make implementing load testing easier and more likely to be well received by your team.