$("#lhsPanelBar").kendoMenu({
    orientation: 'vertical',
    dataSource:
        {
            type: 'json',
            transport:  {
                    read: "http://localhost:3549/api/LHSMenu"
                }
        },
});

public class LHSMenuController : ApiController
{
    private IRepo repo;
    public LHSMenuController()
    {
        repo = new Repository();
    }

    [HttpGet]
    public IEnumerable<LHSMenu> GetLHSMenu()
    {
        return this.repo.Menu;
    }
}

[HttpGet]
public IEnumerable<LHSMenu> GetLHSMenu()
{
    return Json(this.repo.Menu,JsonBehavoir.AllowGet);
}