System.IO.FileInfo.ToString C# (CSharp) Method

        public override String ToString()
        {
            return DisplayPath;
        }

 public void Add(string a)
 {
     using (StreamWriter writer = new StreamWriter(file.ToString(), true, System.Text.Encoding.Default))
     {
         writer.WriteLine(DateTime.Now + " - " + a);
     }
 }