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int counter = 0;
string proposedDest = dest;
while(counter < 5000)
{
  if (!File.Exists(proposedDest))
  {
    try
    {
      File.Copy(fileToCopy, proposedDest);
      break;
    }
    catch (IOException ex) when ((uint)ex.HResult == 0x80070050)
    {
    }
  }
  counter++;
  proposedDest = Path.Combine(Path.GetDirectoryName(dest),
    Path.GetFileNameWithoutExtension(dest) + 
    "_" + counter + Path.GetExtension(dest));
}
;
if (counter == 5000) 
  throw new Exception($"Could not copy file {fileToCopy} too many retries");