c# - Filter files in a directory according to a date in the file name -

i need filter files in directory based on date in file name.

the name has 4 groups of numbers:

9999.99999.201305021219.99999999.txt 

when there more 1 file second group of numbers repeated want use newer 1 based on date on third group of numbers (yyyymmddhhmm).

if there these files in directory:

1   1100.04037.201305090945.04542592.txt 2   1100.04041.201305091108.04542707.txt 3   1100.04041.201305091117.60563353.txt 4   1100.04047.201305080942.04541666.txt 5   1100.24084.201305021658.04539125.txt 6   1100.24084.201305061731.04540560.txt 

i want in lines 2 , 5 discarded. how managed iterate on directory files:

    public static void main(string[] args)     {         string directory = @"\\some\net\path";         string[] arquivos = directory.getfiles(directory, "1100.*.txt", searchoption.topdirectoryonly);         foreach (string arquivo in arquivos)         {             console.writeline(arquivo.substring(directory.length + 1));         }         console.readline();     } 

var files = arquivos            .select(f => new{orgname = f, parts = new fileinfo(f).name.split('.')})            .groupby(x=>x.parts[1])            .select(g=>g.orderbydescending(x=>x.parts[2]).first().orgname);  foreach (string arquivo in files) {     ..... }