For example, suppose you’re typing some code and you decide you need a variable named id, and instead of defining it first, you start typing a statement that begins with id and a space. I always type a space between my variable and the equals sign. Because id is not defined anywhere, IntelliSense will find something that begins with those two letters that is syntactically correct in accordance with the references, namespaces, and context of your code. In my particular case, IntelliSense decided that I really wanted to define a variable of interface type IDataGridColumnStyleEditingNotificationService, an interface I’ve never had occasion to use.
On the plus side, if you really need to define an object of type IDataGridColumnStyleEditingNotificationService, all you need do is type id and a space.
If that’s wrong, you can eliminate IntelliSense’s proposed code and go back to what you originally typed with the Undo key combination Ctrl-Z. I wish I could slap its hand and say “No,” but Ctrl-Z is the only thing that works. Who could ever have guess that Ctrl-Z would become one of the most important keystrokes in using modern Windows applications? Ctrl-Z works in Microsoft Word as well, when Word is overly aggressive about fixing your typing.
Now, I have to caveat this with the observation that I've not used VisualStudio - but boy, that sure sounds like something annoying rather than something useful. What it reminds me of more than anything else is that damnable "feature" of Microsoft Word that knows where the bullet points go better than I do.
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