System.IO.StreamWriter.Close C# (CSharp) Method

        public override void Close()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

 /// <summary>
 /// Запись в ЛОГ-файл
 /// </summary>
 /// <param name="str"></param>
 public void WriteToLog(string str, bool doWrite = true)
 {
     if (doWrite)
     {
         StreamWriter sw = null;
         FileStream fs = null;
         try
         {
             string curDir = AppDomain.CurrentDomain.BaseDirectory;
             fs = new FileStream(curDir + "teplouchetlog.pi", FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
             sw = new StreamWriter(fs, Encoding.Default);
             if (m_vport == null) sw.WriteLine(DateTime.Now.ToString() + ": Unknown port: adress: " + m_address + ": " + str);
             else sw.WriteLine(DateTime.Now.ToString() + ": " + m_vport.GetName() + ": adress: " + m_address + ": " + str);
             sw.Close();
             fs.Close();
         }
         catch
         {
         }
         finally
         {
             if (sw != null)
             {
                 sw.Close();
                 sw = null;
             }
             if (fs != null)
             {
                 fs.Close();
                 fs = null;
             }
         }
     }
 }