Data --> Textbox

Hi, I'm trying to do a simple application where I have a textbox which I bind to a SQL-database.

The binding works fine, but when Im changing the value in the textbox, I want the database to be updated with the new value.

Im using a SqlDataAdapter and its "update"-method, but it doesnt work.

Does anyone have small example (or URL) with an example of this?

Thanks in advance!