สอบถามการทำงาน Transactions และ roll back Sql server

private static void ExecuteSqlTransaction(string connectionString)
{
    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        connection.Open();

        SqlCommand command = connection.CreateCommand();
        SqlTransaction transaction;

 
        transaction = connection.BeginTransaction("SampleTransaction");


        command.Connection = connection;
        command.Transaction = transaction;

        try
        {
            command.CommandText =
                "UPDATE Table1 Set Field1 = '1' Where Field = 'value';";
            command.ExecuteNonQuery();
            command.CommandText =
                "UPDATE Table2 Set Field1= '2' Where Field = 'value'";
            command.ExecuteNonQuery();

            command.CommandText =
                "UPDATE Table3 Set Field1= '3' Where Field = 'value'";
            command.ExecuteNonQuery();

            // Attempt to commit the transaction.
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Commit Exception Type: {0}", ex.GetType());
            Console.WriteLine("  Message: {0}", ex.Message);

            // Attempt to roll back the transaction. 
            try
            {
                transaction.Rollback();
            }
            catch (Exception ex2)
            {
                // This catch block will handle any errors that may have occurred 
                // on the server that would cause the rollback to fail, such as 
                // a closed connection.
                Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType());
                Console.WriteLine("  Message: {0}", ex2.Message);
            }
        }
    }
}