Changes commited to the database only after I update OracledataAdapter twice

Question

Hi. I am using oracledataadapter to manage the data which is eventually displayed in winform datagridview (Visual Studio 2012)
everything works fine , but I have to click "Save" buttin twice to see the changes in the database (Oracle express 11g)
Can you please advice....
Here is my code
it is very simple
1. Obtain connection
2. Create dataadapter
3. Create commands
4. Fill the datatable and dataset
public partial class Concordance : Form
        OracleDataAdapter setupAdapter;
        DataSet projDataset;
        OracleConnection conn;
        //binding sources
        BindingSource setupBindingSource = new BindingSource();
        DataTable setupTable;
        public Concordance()
            InitializeComponent();
            //load tables
            loadSetup();
        //setup table
        private void loadSetup()
            string oradb = ConfigurationManager.ConnectionStrings["OpenU"].ConnectionString;
            conn = new OracleConnection(oradb);
            try
               // using (conn = new OracleConnection(oradb))
                setupAdapter = new OracleDataAdapter("select * from ou_setup", conn);
                    OracleCommandBuilder builder = new OracleCommandBuilder(setupAdapter);
                    projDataset = new DataSet("Concordia");
                    setupTable = new DataTable("Setup");
                    projDataset.Tables.Add(setupTable);
                    setupAdapter.Fill(projDataset,"Setup");
                    //bind the gataGridView
                    this.setupGrid.DataSource = projDataset.Tables["Setup"];
                    this.setupBindingSource.DataSource = projDataset.Tables["Setup"];
                    this.setupNavigator.BindingSource = this.setupBindingSource;
            catch (Exception ex)
                string error = ex.Message;
                MessageBox.Show(error);
        private void saveSetupBtn_Click(object sender, EventArgs e)
           // only after sabe button clicked for the second time the changes are commited into the database
            this.setupAdapter.Update(projDataset.Tables["Setup"]);
            MessageBox.Show("saved");

Answer 1

How are you reading in the object initially? The problem is likely that you are modifying an object from the session cache. When you then read in the object from the uow, it uses the object in the session cache as the back up. So there will not appear to be any changes to persist to the database.
You will need to make a copy of the object for modification, or use the copy from the unitofwork to make the changes instead of working directly on the object in the session. Disabling the cache means there is no copy in the session cache to use as a back up, so the uow read has to build an object from the database.
Best Regards,
Chris