Use KeyUpEvent/Handler instead of KeyPressEvent/Handler. Also you should build in a small timer so you do not fire server requests on every KeyUpEvent. So on each KeyUpEvent you schedule the same timer instance that should execute in the next 50ms (just an example). The timer then does the server search request. That way you will always ask the server for the search result 50ms after the last key has been typed. So it reduces the amount of server requests while typing in the textbox.
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