`private void button1_Click(object sender, EventArgs e)
        {
            //int isP = 0;
            string a = comboBox1.Text;
            string ConString = " datasource = localhost; port = 3306; username = root; password = 3306";

            {


            {
                string sql = "SELECT count (*) FROM [initialentry] WHERE aircraft_number = @a";
                using (MySqlConnection cn = new MySqlConnection(ConString))
                {
                    cn.Open();
                    using (MySqlCommand cmd = new MySqlCommand(sql, cn))
                    {
                        cmd.Parameters.AddWithValue("@aircraft_number", a);
                        MySqlDataReader reader = cmd.ExecuteReader();

                        if (reader.HasRows)
                        {
                            label1.Text = "Record exists";

                        }
                        else
                        {
                            label1.Text = "Record does not exist";
                        }




                    }
                }
            }
        }
    }`