public delegate void ErrorDelegateFuncType(MachAppendException e);

String sConnString = String.Format("DSN={0};PORT_NO={1};UID=;PWD=MANAGER;", SERVER_HOST, SERVER_PORT);
MachConnection sConn = new MachConnection(sConnString);
sConn.Open();
//... do something
sConn.Close();

String sConnString = String.Format("DSN={0};PORT_NO={1};UID=;PWD=MANAGER;", SERVER_HOST, SERVER_PORT);
using (MachConnection sConn = new MachConnection(sConnString))
{
    sConn.Open();
    //... do something
} // you don't need to call sConn.Close();

String sConnString = String.Format("DSN={0};PORT_NO={1};UID=;PWD=MANAGER;", SERVER_HOST, SERVER_PORT);
using (MachConnection sConn = new MachConnection(sConnString))
{
    String sQueryString = "CREATE TABLE tab1 ( col1 INTEGER, col2 VARCHAR(20) )";
    MachCommand sCommand = new MachCommand(sQueryString , sConn)
    try
    {
        sCommand.ExecuteNonQuery();
    }
    catch (MachException me)
    {
        throw me;
    }
}

String sConnString = String.Format("DSN={0};PORT_NO={1};UID=;PWD=MANAGER;", SERVER_HOST, SERVER_PORT);
using (MachConnection sConn = new MachConnection(sConnString))
{
    String sQueryString = "CREATE TABLE tab1 ( col1 INTEGER, col2 VARCHAR(20) )";
    using(MachCommand sCommand = new MachCommand(sQueryString , sConn))
    {
        try
        {
            sCommand.ExecuteNonQuery();
        }
        catch (MachException me)
        {
            throw me;
        }
    }
}

String sConnString = String.Format("DSN={0};PORT_NO={1};UID=;PWD=MANAGER;", SERVER_HOST, SERVER_PORT);
using (MachConnection sConn = new MachConnection(sConnString))
{
    String sQueryString = "SELECT * FROM tab1;";
    using(MachCommand sCommand = new MachCommand(sQueryString , sConn))
    {
        try
        {
            MachDataReader sDataReader = sCommand.ExecuteReader();
            while (sDataReader.Read())
            {
                for (int i = 0; i < sDataReader.FieldCount; i++)
                {
                    Console.WriteLine(String.Format("{0} : {1}",
                                                    sDataReader.GetName(i),
                                                    sDataReader.GetValue(i)));
                }
            }
        }
        catch (MachException me)
        {
            throw me;
        }
    }
}

String sConnString = String.Format("DSN={0};PORT_NO={1};UID=;PWD=MANAGER;", SERVER_HOST, SERVER_PORT);
using (MachConnection sConn = new MachConnection(sConnString))
{
    string sSelectQuery = @"SELECT *
        FROM tab2
        WHERE CreatedDateTime < @CurrentTime
        AND CreatedDateTime >= @PastTime";

    using (MachCommand sCommand = new MachCommand(sSelectQuery, sConn))
    {
        DateTime sCurrtime = DateTime.Now;
        DateTime sPastTime = sCurrtime.AddMinutes(-1);

        try
        {
            sCommand.ParameterCollection.Add(new MachParameter { ParameterName = "@CurrentTime", Value = sCurrtime });
            sCommand.ParameterCollection.Add(new MachParameter { ParameterName = "@PastTime", Value = sPastTime });

            MachDataReader sDataReader = sCommand.ExecuteReader();

            while (sDataReader.Read())
            {
                for (int i = 0; i < sDataReader.FieldCount; i++)
                {
                    Console.WriteLine(String.Format("{0} : {1}",
                                                    sDataReader.GetName(i),
                                                    sDataReader.GetValue(i)));
                }
            }
        }
        catch (MachException me)
        {
            throw me;
        }
    }
}

String sConnString = String.Format("DSN={0};PORT_NO={1};UID=;PWD=MANAGER;", SERVER_HOST, SERVER_PORT);
using (MachConnection sConn = new MachConnection(sConnString))
{
    using (MachCommand sAppendCommand = new MachCommand(sConn))
    {
        MachAppendWriter sWriter = sAppendCommand.AppendOpen("tab2");
        sWriter.SetErrorDelegator(AppendErrorDelegator);

        var sList = new List<object>();
        for (int i = 1; i <= 100000; i++)
        {
            sList.Add(i);
            sList.Add(String.Format("NAME_{0}", i % 100));

            sAppendCommand.AppendData(sWriter, sList);

            sList.Clear();

            if (i % 1000 == 0)
            {
                sAppendCommand.AppendFlush();
            }
        }

        sAppendCommand.AppendClose(sWriter);
        Console.WriteLine(String.Format("Success Count : {0}", sWriter.SuccessCount));
        Console.WriteLine(String.Format("Failure Count : {0}", sWriter.FailureCount));
    }
}

        private static void AppendErrorDelegator(MachAppendException e)
        {
            Console.WriteLine("{0}", e.Message);
            Console.WriteLine("{0}", e.GetRowBuffer());
        }