System Date Time Check Format

This program executes the system date time format. Is it in dd/mmm/yyyy or other format and the which cultuerInfo is the system running on.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Globalization;
using System.Windows.Forms;

namespace SystemDateTimeCheck
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            // Get the Current System culture.
            CultureInfo ci = CultureInfo.CurrentCulture;
            DateTimeFormatInfo dtfi = ci.DateTimeFormat;
            string[] SystemDateTimePatterns = new string[250];
            int i = 0;
            foreach (string name in dtfi.GetAllDateTimePatterns('d'))
            {
                SystemDateTimePatterns[i] = name;
                i++;
            }
            string[] myDateTimeFormat = { "dd-MMM-yy", "dd-MMM-yyyy" };
            if (myDateTimeFormat[0].Equals(SystemDateTimePatterns[0]) || myDateTimeFormat[1].Equals(SystemDateTimePatterns[0]))
                MessageBox.Show("Your System DateTime Format " + SystemDateTimePatterns[0] + " is OK");
            else
                MessageBox.Show("Your System DateTime Format is: " + SystemDateTimePatterns[0] + "\n" + "Required DateTime Format: dd-MMM-yy Or dd-MMM-yyyy");
        }
    }
}