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using (FileStream stream = new FileStream("test.txt", FileMode.Create, FileAccess.Write))
{
using (StreamWriter writer = new StreamWriter(stream))
{
int start = textBox.Lines.Length - 10;
if (start < 0)
{
start = 0;
}
for (int index = start; index < textBox.Lines.Length; ++index)
{
writer.WriteLine(textBox.Lines[index]);
}
}
}