I've got a textbox I'd like to search for a particular word.

Let's say that I've got a textbox called txtTest and it's text property is equal to "Hello and thank you for helping me" I'd like to search this textbox for the word "you"
If it contains this word then show me a messagebox telling me so.
If it doesn't contain this word, show me a messagebox telling me it's not there.

How do I do this?

Thanks!
Reid