// This function takes arguments for 2 connection strings and commands to create a transaction
// involving two SQL Servers. It returns a value > 0 if the transaction is committed, 0 if the
// transaction is rolled back. To test this code, you can connect to two different databases
// on the same server by altering the connection string, or to another 3rd party RDBMS by
// altering the code in the connection2 code block.
static public int CreateTransactionScope(string connectString1, string connectString2,string commandText1, string commandText2)
{// Initialize the return value to zero and create a StringWriter to display results.int returnValue = 0;System.IO.StringWriter writer = new System.IO.StringWriter();try{// Create the TransactionScope to execute the commands, guaranteeing// that both commands can commit or roll back as a single unit of work.using (TransactionScope scope = new TransactionScope()){using (SqlConnection connection1 = new SqlConnection(connectString1)){// Opening the connection automatically enlists it in the // TransactionScope as a lightweight transaction.
                connection1.Open();// Create the SqlCommand object and execute the first command.SqlCommand command1 = new SqlCommand(commandText1, connection1);returnValue = command1.ExecuteNonQuery();writer.WriteLine("Rows to be affected by command1: {0}", returnValue);// If you get here, this means that command1 succeeded. By nesting// the using block for connection2 inside that of connection1, you// conserve server and network resources as connection2 is opened// only when there is a chance that the transaction can commit.   using (SqlConnection connection2 = new SqlConnection(connectString2)){// The transaction is escalated to a full distributed// transaction when connection2 is opened.
                    connection2.Open();// Execute the second command in the second database.returnValue = 0;SqlCommand command2 = new SqlCommand(commandText2, connection2);returnValue = command2.ExecuteNonQuery();writer.WriteLine("Rows to be affected by command2: {0}", returnValue);}}// The Complete method commits the transaction. If an exception has been thrown,// Complete is not  called and the transaction is rolled back.
            scope.Complete();}}catch (TransactionAbortedException ex){writer.WriteLine("TransactionAbortedException Message: {0}", ex.Message);}catch (ApplicationException ex){writer.WriteLine("ApplicationException Message: {0}", ex.Message);}// Display messages.
    Console.WriteLine(writer.ToString());return returnValue;
}