var model = new (Backbone.Model.extend());

var BackboneView = Backbone.View.extend({
        _modelBinder: undefined,
        template: _.template($("#task-template").html()),
        el: $("#taskViewContainer"),
        initialize: function () {
            this._modelBinder = new Backbone.ModelBinder();
            this.listenTo(this.model, 'change', this.render);
        },

        render: function () {

            $(this.el).html(this.template(this.model.toJSON()));

            var bindings = {
                Name: '[id=inputName]',
                IsMain: '[id=cbMain]',
                IdType: { selector: '[id=selectType]' }
            };

            this._modelBinder.bind(this.model, this.el, bindings);
            return this;
        }

    });

window.buttonSave_click = function () {
        var param = new Object();
        param.dto = model;

        $.ajax({
            type: "POST",
            contentType: "application/json; charset=utf-8",
            url: "TaskWebService.asmx/Save",

            data: JSON.stringify(param),

            dataType: "json",
            beforeSend: function (xr) {

            },
            success: function (data, textStatus) {

            },
            error: function (XHR, errStatus, errorThrown) {
                var err = JSON.parse(XHR.responseText);
                var errors = JSON.parse(err.Message);
                //тут надо как-то выделить контролы, которые связаны со свойствами, для которых на серверной стороне произошли ошибки валидации
            }
        });
    };

[WebMethod(EnableSession = true)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public void Save(Task dto)
        {
            List<ErrorTarget> messages = new List<ErrorTarget>() 
            { 
                new ErrorTarget(){ PropName = "Name", ErrorDescription="Не верный формат имени"},
                new ErrorTarget(){ PropName = "Name", CollectionName="Events", ItemIndex = 2, ErrorDescription="Не верный формат названия"},
                new ErrorTarget(){ PropName = "Name", CollectionName="Events", ItemIndex = 4, ErrorDescription="Не верный формат названия"}
            };
            
            string messageJSON = null;
            using (MemoryStream stream = new MemoryStream())
            {
                DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(List<ErrorTarget>));
                ser.WriteObject(stream, messages);
                stream.Position = 0;
                using (StreamReader sr = new StreamReader(stream))
                {
                    messageJSON = sr.ReadToEnd();
                }
            }

            throw new BLLException(messageJSON);
        }

<script type="text/template" id="task-template">
    <table>
        <tr>
            <td>Наименование</td>
            <td><input value='{%- Name %}' id='inputName'></td>
        </tr>
        <tr>
            <td>Тип</td>
            <td>
                <select id='selectType'>
                    {% _.each(taskTypeList, function(e) { %}
                    <option {%- IdType==e.Id?'selected':'' %} value='{%- e.Id %}'>{%- e.Name %}</option>
                    {% }) %}
                </select>
            </td>
        </tr>
        <tr>
            <td>Основная</td>
            <td><input id='cbMain' {%- IsMain?'checked':'' %} type='checkbox' /></td>
        </tr>
    </table>
    <div>События:</div>
    <table>
        <tr>
            <th>ID</th><th>Name</th>
        </tr>
        {% _.each(Events, function(e) { %}
        <tr>
            <td>{%- e.Id %}</td>
            <td>{%- e.Name %}</td>
        </tr>
        {% }) %}
        </tr>
    </table>
    </script>