string[] textfileList = Directory.GetFiles(textfilePath, textfileFilter);
if (textfileList.Length > 0) {
	DateTime dt = new DateTime(2001,1,1);
	DateTime fileLastChange;
	string fileLastChanged = "";
	foreach(string textfile in textfileList) {
		fileLastChange = File.GetLastWriteTime(textfile);
		if (fileLastChange > dt) {
			dt = fileLastChange;
			fileLastChanged = textfile;
		}
	}
	if (fileLastChanged != "") {
		LoadText(fileLastChanged);
	}
}

public string GetNewestFilesName( string DirectoryName, string FileMask )
{
   DateTime newestDate = DateTime.MinValue;
   int newestIndex = 0;
   FileInfo[] Files = (new DirectoryInfo( DirectoryName )).GetFiles( FileMask );
   for ( int i = 0; i < Files.Length; i+ )
   {
      if (newestDate < Files[i].LastWriteTime)
      {
         newestDate = Files[i].LastWriteTime;
         newestIndex = i;
      }
   }
   return (Files.Length > 0) ? Files[newestIndex].FullName : null;
}