issue with listBox , doesn't display the whole item

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C#

ListBox

Hi ,
I have a listBox , i set the property DrawMode to OwnerDrawVariable and i change the height of the item according to the number of lines in the item the problem is that the last item is not displayed completely , can somebody help me please :s

        StreamReader fileRead = new StreamReader(myFilePath);

        string line = fileRead.ReadLine();

        string LookFor = textBox3.Text;

        string bloc;

        while (line != null)
        {
            if (line.Contains(LookFor))
            {
                bloc = line + "\r\n";

                line = fileRead.ReadLine();

                 do
                 {
                     bloc = bloc + line + "\r\n";

                     line = fileRead.ReadLine();
                 }
                 while ((line != null) && !((line.EndsWith("Something")) ||(line.EndsWith("Somethingelse"))));

                 if ((line != null) && ((line.EndsWith("Something")) || (line.EndsWith("Somethingelse"))))
                 {
                     bloc = bloc + line + "\r\n" ;

                     listBox1.Items.Add(bloc);

                 }

             }
                line = fileRead.ReadLine();
            }


        }

private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
{
    e.DrawBackground();
    e.DrawFocusRectangle();
    e.Graphics.DrawString(
         (string)listBox1.Items[e.Index],
         e.Font,
         new SolidBrush(e.ForeColor),
         e.Bounds);
}

private void listBox1_MeasureItem(object sender, MeasureItemEventArgs e)
{
    e.ItemHeight = 13 * GetLinesNumber((string)listBox1.Items[e.Index]);
}

private int GetLinesNumber(string text)
{
    int count = 1;
    int pos = 0;
    while ((pos = text.IndexOf("\r\n", pos)) != -1) { count++; pos += 2; }
    return count;
}

what this is suppose to do is to look for "lookFor" in a text file if it finds it , it should put everething that is between the line that contains "lookFor" and the line that ends with "Somthing" or the one that ends with "Somthingelse" in a bloc of lines that will be an item of the listbox
now the number of lines of this items is not fixed so the itemheught varies from an item to anthor that's why i used the MeasureItem but the problem i'm facin is that the last item of this listBox is not displayed correctely ther is some lines missing
hope that's clear now
thank you