//GetAll

        [OperationContract]

        [WebInvoke(Method = "POST", UriTemplate = "GetAll/{Token}", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare )]

        List<DataModal.Main.Company > GetAll(string Token);

$("#btnCom").click(function(){
    $.ajax({
        type: "POST", //REQUEST TYPE
        dataType: "json", //RESPONSE TYPE
        url: "http://ws/method/token", // URL OF THE WS
        success: function(data) {
            $.each(data, function(i) {
                if (data.length != i) {
                    $('#list').append("<option>" + data[i].Name + "</option>"); //fILL THE DDL. FOR EACH ITEM RETURNED ADD DATA[NAME] TO ONE LINE OF THE DDL.
                }
            });
        },
        error: function(err) {
            console.log("AJAX error in request: " + JSON.stringify(err, null, 2));
        }
    }).always(function(jqXHR, textStatus) {
        if (textStatus != "success") {
            alert("Error: " + jqXHR.statusText);
        }
    })
});