public async Task<bool> Update(VehicleHeadType item)
        {
            var ht = await IdExist(item.Id);

            ht.Name = item.Name;

            _db.Entry(ht).State = EntityState.Modified;
            try
            {
                await _db.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException exception)
            {
                throw new DbUpdateConcurrencyException(exception.Message);
            }

            return true;
        }
        public async Task<VehicleHeadType> Add(VehicleHeadType item)
        {
            var ht = new VehicleHeadType
            {
                Name = item.Name,
            };

            ht = _db.VehicleHeadTypes.Add(ht);
            try
            {
                await _db.SaveChangesAsync();
                return ht;
            }
            catch (DbUpdateConcurrencyException exception)
            {
                throw new DbUpdateConcurrencyException(exception.Message);
            }
        }