Question

How can i get the last line in a textbox by clicking a button. With that code i get the first line …

 private void btnProbe_Click(object sender, EventArgs e)
    {

       string[] first = txtRec.Text.Split(new char[] { '\n' }[0]);
       probe.Text = txtRec.Lines[0];
    }

Answer 1

You don’t need to split the string, just use:

private void btnProbe_Click(object sender, EventArgs e)
{
     if(txtRec.Lines.Length>1)        
        probe.Text = txtRec.Lines[txtRec.Lines.Length - 1];
}