Include the client JavaScript & CSS libraries

	<link rel="stylesheet" type="text/css" href="dbnetsuite.css.ashx" />
	<script language="JavaScript" src="dbnetsuite.js.ashx"></script>

Client-side configuration script

	<script>
	jQuery(document).ready( init )

	function init()
	{
		var dbnetedit1 = new DbNetEdit("dbnetedit1");
		with (dbnetedit1)
		{
			connectionString = "SamplesDatabase"
			fromPart = "Customers"

			setColumnExpressions("CompanyName","Country", "City")
			setColumnProperty("CompanyName","label","Company")
			setColumnProperty("Country","lookup","select distinct country from customers")
			bind("onFieldValueChanged",countryChanged)
			bind("onRecordSelected",initLookup)
			setColumnProperty("City","lookup","select distinct city from customers where 1=2")

			initialize()
		}
	}

	function countryChanged(sender, args) 
	{
		switch(args.columnName.toLowerCase())
		{
			case "country":
				refreshCities(sender);
				break;
		}
	}

	function initLookup(sender, args) 
	{
		refreshCities(sender);
	}

	function refreshCities(sender) 
	{
		var data = {"Country" : sender.columnValue("country")}
		var response = DbNetLink.Util.webMethod("GetCities", null, data);
		sender.refreshListOptions("city",response.cities);
	}
	</script>

HTML markup

<table>
	<tr>
		<td>
			<div id="dbnetedit1"></div>
		</td>
	</tr>
</table>

Server-side code behind

[WebMethod]
///////////////////////////////////////////////////////////////
public static ListDictionary GetCities(string Country)
///////////////////////////////////////////////////////////////
{
	DbNetData Db = new DbNetData("SamplesDatabase");

	QueryCommandConfig Query = new QueryCommandConfig();
	Query.Sql =	"select distinct city from customers where country = " + Db.ParameterName("country") + " order by city";
	Query.Params["country"] = Country;

	Db.Open();
	Db.ExecuteQuery(Query);
	
	ArrayList Cities = new ArrayList();
	
	while (Db.Reader.Read())
	{
		Object[] City = new Object[2];
		City[0] = Db.ReaderValue("city");
		City[1] = Db.ReaderValue("city");
		Cities.Add(City);
	}

	Db.Close();

	ListDictionary Response = new ListDictionary();
	Response["cities"] = Cities.ToArray();
	return Response;
}