private void calculateflyinghours()
    {
        string ConString = " datasource = localhost; port = 3306; username = root; password = 3306";
        string Querry = " Select sum(Flying_Hours)from aircraft." + Form1.a;

        MySqlConnection ConDatabase = new MySqlConnection(ConString);
        MySqlCommand cmdDataBase = new MySqlCommand(Querry, ConDatabase);


        MySqlDataReader myReader;


        ConDatabase.Open();

        myReader = cmdDataBase.ExecuteReader();


        while ((myReader.Read()))
        {

            sum.Text = Convert.ToString(double.Parse(myReader.GetString(0)));
            progressBar1.Increment(1);
        }
        myReader.Close();
    }