MySql.Data.MySqlClient.MySqlConnection.EnlistTransaction C# (CSharp) Method

        public override void EnlistTransaction(Transaction transaction)
        {
            // enlisting in the null transaction is a noop
            if (transaction == null)
                return;

            // guard against trying to enlist in more than one transaction
            if (driver.CurrentTransaction != null)
            {
                if (driver.CurrentTransaction.BaseTransaction == transaction)
                    return;

                throw new MySqlException("Already enlisted");
            }

            // now see if we need to swap out drivers.  We would need to do this since
            // we have to make sure all ops for a given transaction are done on the
            // same physical connection.
            Driver existingDriver = DriverTransactionManager.GetDriverInTransaction(transaction);
            if (existingDriver != null)
            {
                // we can't allow more than one driver to contribute to the same connection
                if (existingDriver.IsInActiveUse)
                    throw new NotSupportedException(Resources.MultipleConnectionsInTransactionNotSupported);

                // there is an existing driver and it's not being currently used.
                // now we need to see if it is using the same connection string
                string text1 = existingDriver.Settings.ConnectionString;
                string text2 = Settings.ConnectionString;
                if (String.Compare(text1, text2, true) != 0)
                    throw new NotSupportedException(Resources.MultipleConnectionsInTransactionNotSupported);

                // close existing driver
                // set this new driver as our existing driver
                CloseFully();
                driver = existingDriver;
            }
            
            if (driver.CurrentTransaction == null)
            {
                //Need to remove as we dont want to through an exception. 
                //Just dont support it and we'll deal with it client side.

                MySqlPromotableTransaction t = new MySqlPromotableTransaction(this, transaction);
                if (!transaction.EnlistPromotableSinglePhase(t))
                    return;
                //    throw new NotSupportedException(Resources.DistributedTxnNotSupported);

                driver.CurrentTransaction = t;
                DriverTransactionManager.SetDriverInTransaction(driver);
                driver.IsInActiveUse = true;
            }
        }
#endif