There are many examples on the Internet. I used this before, and if you recall, you need to create aspx, which will return the relevant terms as a <BR/>split list:
http://www.dyve.net/jquery/?autocomplete
The documentation shows php in the example, but there is no difference in how the plugin itself works, and as a result I should not have done anything special.
From the documentation:
> $("#input_box").autocomplete("my_autocomplete_backend.php");
In the above example, Autocomplete expects an input element with the identifier "input_box" to exist. When the user starts typing in the input field, autocomplete will request my_autocomplete_backend.php with a GET parameter named q, which contains the current value of the input field. Let's say the user typed "foo" (without the quotes). Will autocomplete then request my_autocomplete_backend.php? q = Foo.
The backend should output values ββfor autocomplete, each of which is one line. The output cannot contain the pipe symbol "|", since this is considered a delimiter (more on this later).
: Foo foo