namespace Reshenie
{
    public partial class Form1 : Form
    {
        public Double sum = 0;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            double c;
            String stc;

            for
            (double db = 2; db < 4; db += 0.001)
            {
                c = (32 + 28 * db - 9 * db * db) * 0.001;
                sum += c;
            }

            
 stc = Convert.ToString(sum);
 textBox6.Text=stc;

        }
    }
}