Date format sorting issue

Question 1

There are many other ways to read a CSV, including just as a raw text file and simple string parsing. You can use some of the suggestions in the other answers here, or you can just populate the results into a DataTable, or whatever. Use whatever you are comfortable with.

The important bit that hasn't been mentioned in the other answers is that you need to be explicit about the datetime format that you are reading. For example, how do I know that 1/2/2013 represents either January 2nd, or February 1st?

Since the file you have is not using an invariant date format (like ISO8601 for example), then you should somewhere be explicitly providing a format, such as:

DateTime dt = DateTime.ParseExact(YourDateString,
                                  "M/d/yyyy",  // or "d/M/yyyy"
                                  CultureInfo.InvariantCulture);

Question 2

Set your CSV as a ODBC source. Then you have to use Schema.ini and set that field as a datetime. See the link: http://msdn.microsoft.com/en-us/library/ms709353.aspx

It should explain this. Then once you're done you can do a SQL Query, and do a simple

  SELECT * ORDER BY [date time] desc

I personally hate using flat text files, if you could use DTS and get it into a relational database of some sort, that'd be a good start.

Question 3

Read your .csv values into an object with a strongly typed DateTime property and then sort.

CsvValue[] values = ReadCsvFile().OrderBy(value => value.DateTime);

Where CsvValue is

public class CsvValue
{
   public string UserName {get; set;}
   public DateTime DateTime {get; set;}
   public string VisitedPage {get; set;}
}