public class Form
    {
        public string Name { get; set; }
        public string Title { get; set; }
        public List<BaseElement> Elements { get; set; }
    }

    public abstract class BaseElement
    {
        public string Name { get; set; }
        public string Title { get; set; }
    }
    public class Section : BaseElement
    {
        public List<TextBox> Elements { get; set; }
    }
    public class TextBox : BaseElement
    {
        public string Value { get; set; }
        public string CssClass { get; set; }
    }

  public class FormBuilderController : Controller
    {
        //
        // GET: /FormBuilder/

        public ActionResult Index()
        {
            var form = new Form();
            var section = new Section() { Title = "Basic Info", Name = "section01" };
            section.Elements.Add(new TextBox() { Name = "txt1", Title = "First Text Box" });
            form.Elements.Add(new TextBox() { Name = "txt1", Title = "Second Text Box" });
            var formJson=JsonConvert.SerializeObject(form);
            return View(formJson);
        }
    }

  <script type="text/ng-template" id="ElementTemplate">  
    <div ng-if="control.Type == 'JbSection'">
    <h2>{{control.Title}}</h2>
    <ul>
        <li ng-repeat="control in control.Elements" ng-include="'ElementTemplate'"></li>
    </ul>
    </div>
    </script>

<script type="text/ng-template" id="element.html">
    {{data.label}}
    <ul>
        <li ng-repeat="element in data.elements" ng-include="'element.html'"></li>
    </ul>
</script>

<ul ng-controller="NestedFormCtrl">
    <li ng-repeat="field in formData" ng-include="'element.html'"></li>
</ul>