Getting at values in a list box

Question

Hi All,

Simple question I have up loaded information to a list box using the below code

  List<SignedDriver> drivers = GetDriverInfo();

          

            foreach (SignedDriver driver in drivers)

                listBox1.Items.Add(driver.DeviceName+","+driver.DriverDate+","+driver.DriverVersion);

this displays the data, I want to check DeviceName & DriverVersion against some values however I can be sure of the exact location (on my PC it's 29 for the correct entry in the collection) however I can't garuntee it on another (Other PC's, Netbooks, Tablets etc.) so I want to be dynamic

 private void button6_Click(object sender, EventArgs e)

        {

            int index = -1;

            //USB Serial Converter  2.8.24.0

            index = listBox1.FindString("2.8.24.0");

            MessageBox.Show("index = " + index.ToString());

        } 
while I know there are multiple enteries with this in the messagebox gives -1 not the at least 2 I was expecting. I having been fighting the code too long today!

Glenn