return more then one JSON object in the same response and parsing it

i have the following code: (simplified for readability)

CSHARP:

        foreach(DataRow dRow in myDS.Tables[0].Rows){
            Company myCompany = new Company();
            myCompany.id = int.Parse(dRow["id"].ToString());
            Companies.Add(myCompany);
        }

        JavaScriptSerializer serializer = new JavaScriptSerializer();
        Response.Write(serializer.Serialize(Companies));
        Response.End();

JQUERY:

$  .getJSON('ajax.aspx?what=' + $  ('input[name="what"]').val() + '&where=' + $  ('input[name="what"]').val(), function (data) {
    $  .each(data, function (key, val) {
        var myCompany = new function () {
            this.id = val.id;
        }
        Companies.push(myCompany);
    });
});

now, i have another object in the CSHARP code, which is named Cities
and i would like to return it in the same request.

something like

Response.Write(serializer.Serialize(Companies));
Response.Write(serializer.Serialize(Cities));
Response.End()

and offcourse parse it on the Client side.

how can i do something like that?

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