Insert Statement

/Closes the window and commits the order to the database
        private void btnComplete_Click(object sender, EventArgs e)
        {
            using(var conn = new OleDbConnection(Utilities.CONNECTION_STRING))
            {
                OleDbCommand cmd = new OleDbCommand
                    ("INSERT INTO tblOrders ([OrdersProducts],[OrdersSoldTo],[OrdersTotalPrice])Values(@Products,@Clients,@TotalCost)");
                cmd.Connection = conn;
                conn.Open();
                if (conn.State == ConnectionState.Open)
                {
                    cmd.Parameters.Add("@Products",OleDbType.VarChar).Value = txtTotal.Text;
                    cmd.Parameters.Add("@Clients",OleDbType.VarChar).Value = cbClients.Text;
                    cmd.Parameters.Add("@TotalCost",OleDbType.Numeric).Value = txtTotalCost.Text;
                    try
                    {
                        cmd.ExecuteNonQuery();
                        conn.Close();  
                    }
                    catch(Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
                else
                {
                    MessageBox.Show("Somethings fucky");
                }
            }