saved to database or not?

I use this code to save a new word to my database :

Code:

---

private void btnOpslaan_Click(object sender, EventArgs e)
        {
            System.Data.SqlClient.SqlCommandBuilder cb;
            cb = new System.Data.SqlClient.SqlCommandBuilder(da);

            DataRow dRow = ds1.Tables["Woorden"].NewRow();

            dRow[1] = txtWoord.Text;

            ds1.Tables["Woorden"].Rows.Add(dRow);

            iMaxRows++;
            iIndex = iMaxRows - 1;

            try
            {
                da.Update(ds1, "Woorden");
            }
            catch (DBConcurrencyException ex)
            {
                string customErrorMessage;
                customErrorMessage = "Concurrency violation\n" + ex.ToString();
                MessageBox.Show(customErrorMessage);

                // Add business logic code to resolve the concurrency violation...
                return;
            }

            MessageBox.Show("Nieuw woord toegevoegd aan de database.");

            btnOpslaan.Enabled = false;
            btnVerwijderen.Enabled = true;
            btnNieuw.Enabled = true;
            btnAnnuleren.Enabled = false;
            txtWoord.Enabled = false;

            ReloadDatabase();
        }

---

When I close my application and reopen it, my database has the new word in it, but after reopening and closing the application a few times, suddenly the database is to it's old state again?!? What's happening?

What is 'da' defined as? Are you debugging using thbe Visual Studio IDE? If so, everytime you recompile to start debugging a copy of the db overwrites the old one.