public IHttpActionResult PostCountry(Country country)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Countries.Add(country);

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateException)
            {
                if (CountryExists(country.Id))
                {
                    return Conflict();
                }
                else
                {
                    throw;
                }
            }

            return CreatedAtRoute("DefaultApi", new { id = country.Id }, country);
        }
        public IHttpActionResult PutCountry(string id, Country country)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != country.Id)
            {
                return BadRequest();
            }

            db.Entry(country).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!CountryExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }