public async Task <IActionResult> PutCrsmtr(string id, Crsmtr crsmtr)
        {
            if (id != crsmtr.CourseNo)
            {
                return(BadRequest());
            }

            _context.Entry(crsmtr).State = EntityState.Modified;

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

            return(NoContent());
        }
        public async Task <ActionResult <Crsmtr> > PostCrsmtr(Crsmtr crsmtr)
        {
            _context.Crsmtr.Add(crsmtr);
            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateException)
            {
                if (CrsmtrExists(crsmtr.CourseNo))
                {
                    return(Conflict());
                }
                else
                {
                    throw;
                }
            }

            return(CreatedAtAction("GetCrsmtr", new { id = crsmtr.CourseNo }, crsmtr));
        }