gistfile1.cs

public class JsonJob
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
    public DateTime DateAdded { get; set; }
    public DateTime? DateModified { get; set; }
}

var job = (from jobs in db.Jobs
            where jobs.Id == jobId
            select jobs).First();

var jsonJob = new JsonJob
{
    Id = job.Id,
    Title = job.Title,
    Description = job.Description,
    DateAdded = job.DateAdded,
    DateModified = job.DateModified
};

return Json(jsonJob);