public async Task <Expos> UpdateExpoAsync(Expos _expos)
        {
            using (var expoContext = new ExposContext())
            {
                expoContext.Entry(_expos).State = EntityState.Modified;

                await expoContext.SaveChangesAsync();
            }

            return(_expos);
        }
        public async Task DeleteExpoAsync(Int32 _id)
        {
            using (var expoContext = new ExposContext())
            {
                var student = await expoContext.Expos.FirstOrDefaultAsync(f => f.expoId == _id);

                expoContext.Entry(student).State = EntityState.Deleted;

                await expoContext.SaveChangesAsync();
            }
        }