get max and min of date from comma text file

This is the answer using LINQ:

// LINQ elegant code
using (StreamReader sr = new StreamReader(ofd.FileName))
{
        string line;
        var lines = new List<string[]>(); // Create a list to put the lines.
        while ((line = sr.ReadLine()) != null)
                lines.Add(line.Split(',')); // process each line and put on the list
        var dates = (from l in lines
        select new { Date = DateTime.ParseExact(l[1],"yyyyMMdd",null)}); // Get the day of each value, this can be used to get all the fields.
        var min = dates.Min(d=> d.Date); // Ask the Min Date
        var max = dates.Max(d=>d.Date); // Ask the Max Date
                                        
        Console.WriteLine(min.ToString());
        Console.WriteLine(max.ToString());
}
//LINQ Short code with no date time conversion
using (StreamReader sr = new StreamReader(ofd.FileName))
{
        string line;
        var lines = new List<string[]>(); // Create a list to put the lines.
        while ((line = sr.ReadLine()) != null)
                lines.Add(line.Split(',')); // process each line and put on the list
                                        
        var min = lines.Min(l=> l[1]); // Ask the Min Date
        var max = lines.Max(l=> l[1]); // Ask the Max Date
                                        
        Console.WriteLine(min.ToString());
        Console.WriteLine(max.ToString());
}

and the output is:

6/23/2012 12:00:00 AM

6/25/2012 12:00:00 AM

20120623

20120625

---

Don't forget to mark the best replies as answers!