Why is my update code running fine yet not actually updating the table?

Question

When I step through this, it runs fine - the call to Commit executes without dropping into the Rollback block. Yet, the grid (and the underlying table) are not updated.
private void buttonUpdate_Click(object sender, EventArgs e)
const int TICKETID_COLUMN = 0;
String _ticketID = Convert.ToString(dataGridView1.CurrentRow.Cells[TICKETID_COLUMN].Value);
UpdateRecord(
_ticketID,
textBoxTicketSource.Text,
textBoxContactEmail.Text,
textBoxAboutLLSID.Text,
textBoxCategoryID.Text);
private void UpdateRecord(string ATicketID, string ATicketSource, string AContactsEmail, string AAboutLLSID, string ACategoryID)
try
con = new OracleConnection(oradb);
con.Open();
String update = @"UPDATE LLS.INTERPRETERTICKETS
SET TICKETSOURCE = :p_TICKETSOURCE,
ABOUTLLSID = :p_ABOUTLLSID,
CATEGORYID = :p_CATEGORYID,
CONTACTEMAIL = :p_CONTACTEMAIL
WHERE TICKETID = :p_TICKETID";
cmd = new OracleCommand(update, con);
cmd.CommandType = CommandType.Text;
// TICKETSOURCE, ABOUTLLSID, CATEGORYID, CONTACTEMAIL, TICKETID
OracleParameter p_TICKETSOURCE =
new OracleParameter("p_TICKETSOURCE", OracleDbType.NVarchar2, ParameterDirection.Input);
p_TICKETSOURCE.Size = 20;
p_TICKETSOURCE.Value = ATicketSource;
cmd.Parameters.Add(p_TICKETSOURCE);
OracleParameter p_ABOUTLLSID =
new OracleParameter("p_ABOUTLLSID", OracleDbType.Int32, ParameterDirection.Input);
p_ABOUTLLSID.Value = AAboutLLSID;
cmd.Parameters.Add(p_ABOUTLLSID);
OracleParameter p_CATEGORYID =
new OracleParameter("p_CATEGORYID", OracleDbType.Int32, ParameterDirection.Input);
p_CATEGORYID.Value = ACategoryID;
cmd.Parameters.Add(p_CATEGORYID);
OracleParameter p_CONTACTEMAIL =
new OracleParameter("p_CONTACTEMAIL", OracleDbType.NVarchar2, ParameterDirection.Input);
p_CONTACTEMAIL.Size = 100;
p_CONTACTEMAIL.Value = AContactsEmail;
cmd.Parameters.Add(p_CONTACTEMAIL);
OracleParameter p_TICKETID =
new OracleParameter("p_TICKETID", OracleDbType.NVarchar2, ParameterDirection.Input);
p_TICKETID.Size = 20;
p_TICKETID.Value = ATicketID;
cmd.Parameters.Add(p_TICKETID);
try
using (var transaction = con.BeginTransaction())
cmd.Transaction = transaction;
cmd.ExecuteNonQuery();
transaction.Commit();
catch (Exception ex)
ot.Rollback();
throw;
MessageBox.Show("Apparent success");
finally
con.Close();
con.Dispose();
dataGridView1.Refresh();
}

Answer 1

It's hard to say with the limited information available. Nothing jumps out at me as being "wrong" in your code.
What is the Records Affected return value from cmd.ExecuteQuery?
I tested this and it worked fine for me:
SQL
========
SQL> create table interpretertickets (ticketsource nvarchar2(100),
  2  aboutllsid number,
  3  categoryid number,
  4  contactemail nvarchar2(100),
  5  ticketid nvarchar2(100));
Table created.
SQL>
SQL> insert into interpretertickets values(null,null,null,null,1);
1 row created.
SQL> commit;
Commit complete.
/////////////// CODE //////////////////////
        private void button1_Click(object sender, EventArgs e)
            string constr = "data source=orcl;user id=scott;password=tiger";
            OracleConnection con = new OracleConnection(constr);
            con.Open();
            String update = @"UPDATE INTERPRETERTICKETS
SET TICKETSOURCE = :p_TICKETSOURCE,
ABOUTLLSID = :p_ABOUTLLSID,
CATEGORYID = :p_CATEGORYID,
CONTACTEMAIL = :p_CONTACTEMAIL
WHERE TICKETID = :p_TICKETID";
            OracleCommand cmd = new OracleCommand(update, con);
            cmd.CommandType = CommandType.Text;
            // TICKETSOURCE, ABOUTLLSID, CATEGORYID, CONTACTEMAIL, TICKETID
            OracleParameter p_TICKETSOURCE =
            new OracleParameter("p_TICKETSOURCE", OracleDbType.NVarchar2, ParameterDirection.Input);
            p_TICKETSOURCE.Size = 20;
            p_TICKETSOURCE.Value = "newval1";
            cmd.Parameters.Add(p_TICKETSOURCE);
            OracleParameter p_ABOUTLLSID =
            new OracleParameter("p_ABOUTLLSID", OracleDbType.Int32, ParameterDirection.Input);
            p_ABOUTLLSID.Value = 123;
            cmd.Parameters.Add(p_ABOUTLLSID);
            OracleParameter p_CATEGORYID =
            new OracleParameter("p_CATEGORYID", OracleDbType.Int32, ParameterDirection.Input);
            p_CATEGORYID.Value = 456;
            cmd.Parameters.Add(p_CATEGORYID);
            OracleParameter p_CONTACTEMAIL =
            new OracleParameter("p_CONTACTEMAIL", OracleDbType.NVarchar2, ParameterDirection.Input);
            p_CONTACTEMAIL.Size = 100;
            p_CONTACTEMAIL.Value = "[email protected]";
            cmd.Parameters.Add(p_CONTACTEMAIL);
            OracleParameter p_TICKETID =
            new OracleParameter("p_TICKETID", OracleDbType.NVarchar2, ParameterDirection.Input);
            p_TICKETID.Size = 20;
            p_TICKETID.Value = 1;
            cmd.Parameters.Add(p_TICKETID);
            using (var transaction = con.BeginTransaction())
                cmd.Transaction = transaction;
                int recaff = cmd.ExecuteNonQuery();
                MessageBox.Show("records affected: " + recaff);
                transaction.Commit();
        }