I am reading a file into my program using streamreader.

private void loadFile()
    {
        lstDeliveryDetails.Items.Clear(); 
        if (!File.Exists("../../MealDeliveries.txt"))
        {
            MessageBox.Show("File not found!");
            return;
        }

        using (StreamReader sr = new StreamReader("../../MealDeliveries.txt"))
        {
            //first line is delivery name 
            string strDeliveryName = sr.ReadLine();
            while (strDeliveryName != null)
            {
                //other lines 
                Delivery d = new Delivery(strDeliveryName, sr.ReadLine(),
                                          sr.ReadLine(), sr.ReadLine(),
                                          sr.ReadLine(), sr.ReadLine(),
                                          sr.ReadLine());
                mainForm.myDeliveries.Add(d);

                //check for further values
                strDeliveryName = sr.ReadLine();
            }
        }
        displayDeliveries();


    }

Eventually I end up with all the deliveries in the following array

public static ArrayList myDeliveries = new ArrayList();

It is loaded into the listview. I select an item as follows:

iDeliverySelected = lstDeliveryDetails.SelectedItems[0].Index;

I am struggling to understand how I can select an item and use a delete button to remove it from the text file?