int prog = trackBar1.Value -> dane.prog = trackBar1.Value;
int prog1 = (int)numericUpDown1.Value; -> dane.prog1 = (int)numericUpDown1.Value;
int prog2 = (int)numericUpDown2.Value; -> dane.prog2 = (int)numericUpDown2.Value;
int m1 = (int)numericUpDown3.Value; -> dane.m1 = (int)numericUpDown3.Value;
int m2 = (int)numericUpDown4.Value; -> dane.m2 = (int)numericUpDown4.Value;
int m3 = (int)numericUpDown5.Value; -> dane.m3 = (int)numericUpDown5.Value;
int m4 = (int)numericUpDown6.Value; -> dane.m4 = (int)numericUpDown6.Value;
int m5 = (int)numericUpDown7.Value; -> dane.m5 = (int)numericUpDown7.Value;
int m6 = (int)numericUpDown8.Value; -> dane.m6 = (int)numericUpDown8.Value;
int m7 = (int)numericUpDown9.Value; -> dane.m7 = (int)numericUpDown9.Value;
int m8 = (int)numericUpDown10.Value; -> dane.m8 = (int)numericUpDown10.Value;
int m9 = (int)numericUpDown11.Value; -> dane.m9 = (int)numericUpDown11.Value;
int suma = dane.m1+ dane.m2+ dane.m3+ dane.m4+ dane.m5+ dane.m6+ dane.m7+ dane.m8+ dane.m9;

private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            StreamWriter sw = new StreamWriter("dane.xml");
            try
            {
                XmlSerializer serializer = new XmlSerializer(typeof(Dane));
                serializer.Serialize(sw, dane);
                sw.Close();
            }
            catch (Exception err)
            {
                Text = err.ToString();      
            }
            finally
            {
                sw.Close();
            }

        }
        private void Form1_Load(object sender, EventArgs e)
        {
            StreamReader sr = new StreamReader("dane.xml");
            try
            {
                XmlSerializer serializer = new XmlSerializer(typeof(Dane));
                dane = (Dane)serializer.Deserialize(sr);
                trackBar1.Value = dane.prog;
                numericUpDown1.Value = dane.prog1;
                numericUpDown2.Value = dane.prog2;
                numericUpDown3.Value = dane.m1;
                numericUpDown4.Value = dane.m2;
                numericUpDown5.Value = dane.m3;
                numericUpDown6.Value = dane.m4;
                numericUpDown7.Value = dane.m5;
                numericUpDown8.Value = dane.m6;
                numericUpDown9.Value = dane.m7;
                numericUpDown10.Value = dane.m8;
                numericUpDown11.Value = dane.m9;
            }
            catch (Exception err)
            {
                Text = err.ToString();
            }
            finally
            {
                sr.Close();
            }
public class Dane
    {
        public int prog;
        public int prog1;
        public int prog2;
        public int m1, m2, m3, m4, m5, m6, m7, m8, m9;
        
    }