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An extension of the "What if two programs did this?" thought experiment is the "Who says there's only one?" question. A common question I see is, "From a service, how do I do X with the currently logged-on user?" (Where "X" can be a variety of things such as interact with them or impersonate them.) But who says that there's only one? With the int...

Often, you find yourself staring at a stack trace for a caught exception and want to see the original exception. (You too can get symbols for operating system binaries, either by using the symbol server to get the symbols on-demand or, if you have a gigabyte of disk space, you can download symbol packages to get them all at one go. Even if yo...

In the discussion of how to prevent non-"trusted" DLLs from using private OS resources, more than one person suggested having the or function behave differently depending on who the caller is. But we already saw that you can't trust the return address and that you definitely shouldn't use the return address to make a security decision (which i...

When the topic of accessibility comes up, most people think it's all about people with disabilities. While it's true that people with disabilities were the original target audience for accessibility, more recent developments have highlighted the value of accessible technologies to everyone. For one thing, making your program accessible means that ...

What you don't want is a problem that goes away when you debug it. It is expected that a program have additional debugging code inside blocks. After all, that's why it's a debug build. But what you definitely don't want to do is have that debugging to fundamentally change the program's behavior. You can perform additional validation. You can ra...

How local variables are captured.

When the anonymous class becomes visible.

First we'll look at how they're implemented.

When you declare a class inside another class, the inner class still acts like a regular class. The nesting controls access and visibility, but not behavior. In other words, all the rules you learned about regular classes also apply to nested classes. The keyword in an instance methods of a class (nested or not) can be used to access members of...

Sometimes, when I'm debugging a problem, I'll ignore a particular thread and somebody will ask, "What is that thread doing, and how did you know to ignore it?" My reply: "I have no idea what it's doing, but whatever it's doing, it's normal." Tess has been running an excellent series of posts on debugging the CLR, but one of the most important le...