public IHttpActionResult GetAlumnosID()
        {
            var headers = Request.Headers;

            if (headers.Contains("ID"))
            {
                return(Ok(ADO_Alumnos.GetAlumno(Convert.ToInt32(headers.GetValues("ID").First()))));
            }
            return(BadRequest("Error"));
        }
 public IHttpActionResult GetAlumnosID(int ID)
 {
     return(Ok(ADO_Alumnos.GetAlumno(ID)));
 }