MSDN key words : "Change notification", FindFirstChangeNotification, FindNextChangeNotification MSDN article : "Monitoring Changes in a Directory or Directory Tree"

thank you for your answer, trones i solve the problem this way: char cr=(char)13; char lf=(char)10; string strCR,strLF,strCRLF; strCR=cr.ToString(); strLF=lf.ToString(); strCRLF=strCR+strLF; art=art.Replace(strLF,strCRLF); textBox1.Text=art;