FileStream fs = new FileStream(System.AppDomain.CurrentDomain.BaseDirectory + "log.txt",FileMode.Append);
byte[] data1 = System.Text.Encoding.Default.GetBytes(eeee.Message);
byte[] data2 = System.Text.Encoding.Default.GetBytes(eeee.StackTrace);
fs.Write(data1,,data1.Length);
fs.Write(data2, , data2.Length);
fs.Flush();
fs.Close();