How to copy the filename into a new text file

foreach (FileInfo FI in FileList)
         {
             Console.WriteLine(FI.FullName);
             Console.WriteLine(FI.LastWriteTime.ToShortDateString());
             string dt = FI.LastWriteTime.ToShortDateString();
             if(DateTime.Now.ToShortDateString()== dt)
             {
                 readfile(FI);
             }
             Console.WriteLine(dt);
         }