Having a TextBox.Text "listen" for changes then execute code?

See more:

C#

desktop

I've been looking for a way to have a textbox detect that it's text is being changed during runtime and then executing code, (with a delay). I'm basically want to making a dropdown box appear with name suggestions according to what the user writes in the textbox.

I havn't any code, as I'm just looking for this functionality, without witch, I won't bother doing the dropdown and database interactions.

For clarification:

When the user types in "a" all db-objects with a name starting with an "a" gets listed, but only if the user haven't typed another character for 1 second. (so when a character is typed it starts the method, with has a delay it counts through, if it's interrupted by another character it resets, all the while having the contents of the textbox as a variable to use when it gets to count down to zero and executes the dropbox functions).

That's the functionality I'm going for

Thanks for helping a noob!

-frank