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using System.IO;
public void WriteLogLine(string sCallerName, string sLogFolder, 
                        long lCallerInstance, string sLogLine)
{
  lock(this)
  {
    string sFileName;
    sFileName = String.Format("{0}_{1:yyyy.MM.dd}_{2:00}.log", 
                  sCallerName, DateTime.Now, lCallerInstance);
    StreamWriter swServerLog = 
           new StreamWriter(sLogFolder + sFileName, true);
    swServerLog.WriteLine(
           String.Format("[{0:T}] {1}", DateTime.Now, sLogLine));
    swServerLog.Close();
  }
}