I use the old school hungarian… txt for TextBox, btn for Button, followed by a generalized word, then a more specific word. i.e.:
btnUserEmail
Have had a lot of people say things like “omg thats so old, VB6 calling!” But in a UI Rich winforms app, I can find and modify things quicker because usually the first thing you know about a control is it’s type, then it’s category, then get specific. While the newer style naming convention guys are stuck trying to remember what they named that text box.
The original specification for controls is here (archived).