一段事务处理代码

public void DeleteClientFinance(int accountID)
        {
            SqlCommand cmd = null;
            SqlConnection conn = null;
            SqlTransaction trans = null;

            conn = new SqlConnection(connString);
            conn.Open();
            trans = conn.BeginTransaction();

            cmd = new SqlCommand(cmdDeleteBankAccount, conn);
            cmd.CommandType = CommandType.Text;
            cmd.Transaction = trans;

            SqlParameter parameter = new SqlParameter("@AccountID", SqlDbType.Int);
            parameter.Value = accountID;
            cmd.Parameters.Add(parameter);

            try
            {
                cmd.ExecuteNonQuery();
                trans.Commit();
            }
            catch (SqlException ex)
            {
                trans.Rollback();
                throw ex;
            }
            finally
            {
                conn.Close();
                cmd = null;
                conn = null;
            }
            
        }