public async Task <IEnumerable <Supplier> > GetAllSuppliers()
 {
     using (var db = new biusoprojectContext())
     {
         try
         {
             return(await db.Supplier.ToListAsync());
         }
         catch
         {
             throw;
         }
     }
 }
        public async Task <bool> AddSupplier(Supplier supplier)
        {
            using (var db = new biusoprojectContext())
            {
                try
                {
                    db.Supplier.Add(supplier);
                    await db.SaveChangesAsync();

                    return(true);
                }
                catch
                {
                    throw;
                }
            }
        }