How to implement Textbox auto-complete in ASP.NET web forms?

1. Ajax toolkit: AutoCompleteExtender
Reference:
http://www.asp.net/ajax/ajaxcontroltoolkit/samples/autocomplete/autocomplete.aspx
2. JQuery+Web service
http://rayaspnet.blogspot.com/2011/01/how-to-call-aspnet-web-service-from.html

How to set focus on first enabled textbox in ASP.net by JQuery?

    $(document).ready(function () {
        $("input:text:visible:first").focus();
    });

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How to call asp.net web service from Jquery?

        $.ajax({

            type: "POST",

            contentType: "application/json; charset=utf-8",

            url: '<%=ResolveClientUrl("~/WebServices/example.asmx/Method")%>',

            data: "{'parameter1':'" + parametervalue1 + "'}",

            dataType: "json",

            async: false,

            success: function (data) {alert(data.d);}

        });

Reference:

http://api.jquery.com/jQuery.ajax/

How to detect Copy Cut and Paste actions on Textbox in JQuery

$("#<%=Textbox1.ClientID %>").bind('cut copy paste', function(e)
{
    alert(e.type + ' text!');
});