Commit and Rollback Buttons

I need to perform some DMLs on an Oracle DB using ODP.Net. The problem I have is that I need to provide a commit and rollback button after a transaction is executed. The user reviews the result of the transaction and accordingly commits or rolls back the changes. I am unable to persist the db connection across postback and because of this if I wire a commit statement to a button, the transaction has already completed by then and refuses to commit. Here is my code when the insert happens. I make a commit and rollback button visible after it finishes executing. How do i setup a commit and rollback after this step?

OracleConnection objConnection = new OracleConnection();
            objConnection.ConnectionString = ConfigurationManager.ConnectionStrings["connString"].ToString(); ;
            objConnection.Open();
            OracleCommand objCommand = objConnection.CreateCommand();
            //objCommand.Connection = objConnection;
            OracleTransaction myTrans;
            myTrans = objConnection.BeginTransaction(IsolationLevel.ReadCommitted);
            try
            {

                objCommand.CommandText = txtQuery.Text;
                objCommand.CommandType = System.Data.CommandType.Text;
                int delrowcnt = objCommand.ExecuteNonQuery();
                myTrans.Save("a");
                //myTrans.Commit();
                lblError.Text = "";
                //btnCommit.Visible = true;
                //btnRollback.Visible = true;
                this.Transaction = myTrans;
            }
             catch (Exception ex)
            {
                lblError.Text = ex.Message.ToString();
                objConnection.Close();
            }