public async Task<IHttpActionResult> PutStudentCourse(int id, StudentCourse studentCourse)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != studentCourse.StudentCourseId)
            {
                return BadRequest();
            }

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

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!StudentCourseExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }
        public async Task<IHttpActionResult> PostStudentCourse(StudentCourse studentCourse)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.StudentCourses.Add(studentCourse);
            await db.SaveChangesAsync();

            return CreatedAtRoute("DefaultApi", new { id = studentCourse.StudentCourseId }, studentCourse);
        }