Here is  a post that should  hopefully explain how PerfMon can relatively easily be put to good use monitoring PerformanceCounters -- as well as create custom Counter Logs to track an application's performance over time.

Not exactly part of the Framework (PerfMon comes with the OS) and not an article about code -- but adding PerformanceCounters to your application (discussed in another article) relies on your understanding PerformanceCounters in general, and how to monitor applications (the subject comes up in in both certification exams for ASP.NET applications).

Here is link to a post I wrote covering hopefully everything you'll need to know about Globalization and Localization in ASP.NET projects.

Here is a link to a post that I wrote about how to use the EventLog class effectively, with some tips you may find useful. 

Hope you find it useful.

Here is a link to a post that describes in quite a lot of detail all that you'll probably need to know about reading and writing to files, whether Binary or Text files.

Most C# coders know how to use Collections and Dictionaries, but are a bit fuzzy on the internals, and when to choose which one.

This is a link to a post that might help...

Here's a link to a post that describes what CAS is, how it works, and how to use it to control assemblies installed on your machine.

Here is a link to a post that I wrote that covers all you will need to know about how how to Start(), Join(), and Abort() threads, and how to define CriticalRegions(), and how to pass arguments between threads.

Although I would tend towards using webservices these days for most communication between vendor and client, your software may need to send out email.

Here is a link to a post that explains everything you will need to know about writting not only email messages, but rich html messages with embedded images, as well as attaching files.

After you've read this, you'll have enough information to do anything you need -- even conceive of a application that takes a screen grab when errors occur in your application, and mails it to you.

Not so long ago, designing software so that it could be translated to french involved custom solutions, hell, and a lot of funny translations.

Now, making your software so that it formats Dates, Time, Numbers, Currency for each country really is about as easy as it can get.

Here's a link to a post explaining how.

Here's a link to a post that I wrote that covers all the essentials of using the Binary and Soap Formatters...

The XmlSerializer is often discussed in the same breath as the SoapFormatter, even when they are totally different serialization systems with no common inheritance or interfaces.

Here's a link to a post that covers in depth the use of the XmlSerializer -- efficiently.