public async Task <IActionResult> PutProduct(int id, Product product)
        {
            if (id != product.Id)
            {
                return(BadRequest());
            }

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

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

            return(NoContent());
        }
        public async Task <IActionResult> PutRequestLine(int id, RequestLine requestLine)
        {
            if (id != requestLine.Id)
            {
                return(BadRequest());
            }

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

            try
            {
                await _context.SaveChangesAsync();

                //call recalculate
                var success = RecalculateRequestTotal(id);
                if (!success)
                {
                    return(this.StatusCode(500));
                }
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!RequestLineExists(id))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(NoContent());
        }
        public async Task <IActionResult> PutVendors(int id, Vendors vendors)
        {
            if (id != vendors.Id)
            {
                return(BadRequest());
            }

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

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

            return(NoContent());
        }