throw vs throw ex

gistfile1.cs

static void Main(string[] args)
{
    try
    {
        ParseIntGood();
        //ParseIntBad();
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex);
    }

    Console.Read();
}

static void ParseIntGood()
{
    try
    {
        int.Parse("ExceptionMaker");
    }
    catch (Exception e)
    {
        throw;
    }
}

static void ParseIntBad()
{
    try
    {
        int.Parse("ExceptionMaker");
    }
    catch (Exception e)
    {
        throw e;
    }
}

ParseIntGood

System.FormatException: Input string was not in a correct format.
at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean par
seDecimal)
at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
at System.Int32.Parse(String s)
at TcpListenerApp.Program.ParseIntGood() in C:\Projects\TcpListenerApp\TcpListenerApp\Program.cs:line 33
at TcpListenerApp.Program.Main(String[] args) in C:\Projects\TcpListenerApp\TcpListenerApp\Program.cs:line 14

ParseIntBad

System.FormatException: Input string was not in a correct format.
at TcpListenerApp.Program.ParseIntBad() in C:\Projects\TcpListenerApp\TcpListenerApp\Program.cs:line 45
at TcpListenerApp.Program.Main(String[] args) in C:\Projects\TcpListenerApp\TcpListenerApp\Program.cs:line 15