Create StreamWriter class for the specified stream, using the specified encoding and the default buffer size.
using System; using System.IO; public class SWBuff { public static void Main(String[] args) { string logFile = "a.log"; string fileName = "a.log"; string textToAdd = "asdf"; FileStream fs = new FileStream(fileName, FileMode.CreateNew, FileAccess.Write, FileShare.None); StreamWriter swFromFile = new StreamWriter(logFile); swFromFile.Write(textToAdd); swFromFile.Flush(); swFromFile.Close(); } }