private void SaveToFile()
{
            string result = 
                this.Barcode1 + "," +
                this.Barcode2 + "," +
                this.SNoCount + "," +
                this.TimeStamp;
}

System.IO.StreamWriter sw = new System.IO.StreamWriter(@"C:\logfile.txt",true);
sw.WriteLine(result);
sw.Close();

------解决方案--------------------

System.IO.StreamWriter sw = new System.IO.StreamWriter(@"C:\logfile.txt",true);
sw.WriteLine(result);
sw.Flush();
sw.Close();

or

File.WriteAllText("c:\text.txt",text);

------解决方案--------------------
探讨

我在file下面没有找到writeAllText这个方法吗？ 
IO包已经加了