How to delete text between two texts in listbox

[krpi11]

Hi For my application, I need a code that searches for Listbox text that has the beginning and end characters

code for open text to listbox

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Stream myStream = null;
OpenFileDialog openFileDialog1 = new OpenFileDialog();

openFileDialog1.InitialDirectory = "c:\\";
openFileDialog1.Filter = "txt files (*.php)|*.php|All files (*.*)|*.*";
openFileDialog1.FilterIndex = 2;
openFileDialog1.RestoreDirectory = true;

if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
try
{
if ((myStream = openFileDialog1.OpenFile()) != null)
{
using (myStream)
{
textBox1.Text = File.ReadAllText(openFileDialog1.FileName);
}
}
}
catch (Exception ex)
{
MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
}
}

// button 2

for (int n = listBox1.Items.Count - 1; n> = 0; --n)
{
string s = listBox1.Items [n] .ToString ();
{
int start = n. IndexOf ("<-");
int end = n.IndexOf ("->");
{
listBox1.Items.Remove (s);

Listbox will have text

for example

text text text

<-- text to be deleted

text to be deleted

text to be deleted ->

text text text

.......................................

the program will delete everything written in <- -> and so it will stay

text text text

text text text

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