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if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
StreamReader reader = new StreamReader(openFileDialog1.FileName);
string line = reader.ReadLine();
while (line != null)
{
listbox.Items.Add(line);
line = reader.ReadLine();
}
reader.Close();
}
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
listbox.Items.Add(openFileDialog1.FileName);
}