Connection Access Update

public bool Repair(Category cat)
        {
            string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\ThuVien.accdb;";
            OleDbConnection connection = new OleDbConnection(connectionString);
            connection.Open();

            // 2. Chuẩn bị câu truy vấn
            string sql = "update Category set TenSP= @TenSP, DungTich = @DungTich, DoCon = @DoCon, XuatXu = @XuatXu, Gia = @Gia where MaSP = @MaSP";

            OleDbCommand command = new OleDbCommand(sql, connection);
            command.Parameters.Add("@TenSP", OleDbType.VarChar).Value = cat.TenSP;
            command.Parameters.Add("@DungTich", OleDbType.Integer).Value = cat.DungTich;
            command.Parameters.Add("@DoCon", OleDbType.Single).Value = cat.DoCon;
            command.Parameters.Add("@XuatXu", OleDbType.VarChar).Value = cat.XuatXu;
            command.Parameters.Add("@Gia", OleDbType.Integer).Value = cat.Gia;
            command.Parameters.Add("@MaSP", OleDbType.VarChar).Value = cat.MaSP;

            bool ret = false;
            try
            {

                ret = command.ExecuteNonQuery() == 1;
            }
            catch (Exception ex)
            {
                connection.Close();
                return ex.Equals(false);

            }
            connection.Close();
            return ret;
        }