[Q] - C# Filhantering

   OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "Txt files (*.txt)|*.txt";

            if (ofd.ShowDialog() == DialogResult.OK)
            {
                foreach (string line in File.ReadAllLines(ofd.FileName))
                {
                    string[] parts = line.Split(',');
                    foreach (string part in parts)
                    {
                        string[,] siblings = new string[,] { { }, { } };
                    }
                }
            }

int indexChosen = listBox1.SelectedIndex;
            
            for (int i = 0; i < my_ListWithStringsArrays[indexChosen][indexChosen].Count(); i++)
            {
                textBox1.Text = my_ListWithStringsArrays[indexChosen][i];
                textBox2.Text = my_ListWithStringsArrays[indexChosen][i];
                textBox3.Text = my_ListWithStringsArrays[indexChosen][i];
                textBox4.Text = my_ListWithStringsArrays[indexChosen][i];
                textBox5.Text = my_ListWithStringsArrays[indexChosen][i];
                textBox6.Text = my_ListWithStringsArrays[indexChosen][i];
                textBox7.Text = my_ListWithStringsArrays[indexChosen][i];
            }

DialogResult dlg = MessageBox.Show("Vill du spara i en ny eller i den aktuella filen?\nNej för ny, Ja för denna.", "Obs!", MessageBoxButtons.YesNo);

            if (dlg == DialogResult.Yes)
            {
                try
                {
                    List<string> existing = new List<string>();
                    foreach (Control ctrl in groupBox1.Controls)
                    {
                        if (ctrl is TextBox)
                        {
                            existing.Add(((TextBox)ctrl).Text);
                            existing.Add(", ");
                        }
                    }
                    int max = existing.Count() - 1;
                    existing.RemoveAt(max);

                    FileStream fs = File.Open(@activeFile, FileMode.Open, FileAccess.Write);
                    StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
                    
                    foreach (string s in existing)
                    {
                        complete = s;
                    }
                    sw.Write(complete);
                    sw.Close();
                }
                catch (Exception)
                {

                }
            }

private void textBox1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                my_ListWithStringsArrays[indexChosen][0] = textBox1.Text;
            }
            osv
        }

FileStream fs = File.Open(@activeFile, FileMode.Open, FileAccess.ReadWrite);
                        StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
                        List<string> existing = new List<string>();
                        string completeLine = "";
                        string[] lista = new string[7];
                        
                        foreach (Car aCar in car) 
                        {
                            lista = aCar.list();
                            foreach (string s in lista)
                            {
                                completeLine = string.Join(",", lista);
                            }
                        }
                        MessageBox.Show(completeLine); //ger positivt resultat
                        sw.WriteLine(completeLine);     //funkar inte
                        sw.Close();                     //funkar

public string[] list()
        {
            string[] aList = new string[7];
            aList[0] = CarFact[0][0].ToString();
            aList[1] = CarFact[0][1].ToString();
            aList[2] = CarFact[0][2].ToString();
            aList[3] = CarFact[0][3].ToString();
            aList[4] = CarFact[0][4].ToString();
            aList[5] = CarFact[0][5].ToString();
            aList[6] = CarFact[0][6].ToString();

            return aList;
        }

public string[] list()
        {
            string[] aList = new string[7];
            for (int i = 0; i < CarFact[0].Count(); i++)
            {
                aList[i] = CarFact[0][i].ToString();
            }
            return aList;
        }

FileStream fs = File.Open(@activeFile, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                        StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
                        
                        foreach (Car Car in car)
                        {
                            lista = Car.list();
                            
                                completeLine = string.Join(", ", lista);
                                sw.WriteLine("");
                                sw.Write(completeLine);
                        }
                        sw.Close();                 
                        sw = null;
                        fs.Close();

while ((line = readFile.ReadLine()) != null)
                        {
                            _row = line.Split(',');
                            my_ListWithStringsArrays.Add(_row);
                        }
                        my_ListWithStringsArrays.RemoveAt(0);

                        foreach (string[] s in my_ListWithStringsArrays)
                        {
                            //newCar = new Car(); funkar inte
                            newCar.InitCar(s[0], s[1], s[2], s[3], s[4], s[5], s[6]);
                            car.Add(newCar);
                        }
                        listBox1.Items.Add(newCar.GetPlate());

FileStream fs = File.Open(@activeFile, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                        StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
                        
                        foreach (Car Car in car)
                        {
                            sw.WriteLine(Car.ToString());
                        }

string line;
                        string[] row;

                        while ((line = readFile.ReadLine()) != null)
                        {
                            row = line.Split(',');
                            my_ListWithStringsArrays.Add(row);
                        }

                        foreach (string[] s in my_ListWithStringsArrays)
                        {
                                Car aCar = new Car(s[0], s[1], s[2], s[3], s[4], s[5], s[6]);
                                car.Add(aCar);
                        }
                        int newCar = car.Count();
                        listBox1.Items.Add(car[newCar].GetPlate());

public Car(string plate, string modell, string type, string productionYear, string color,
                            string length, string value)
        {
            Plate = plate;
            Modell = modell;
            Type = type;
            ProductionYear = productionYear;
            Color = color;
            Length = length;
            Value = value;
        }