sorting data - dhod software

salam codding :D
slamat bertemu kembali dengan saya..kali ini saya akan berbagi tentang tugas kuliah saya..tentang pengurutan data atau sorting dengan menggunaka v.studio 2012. c# windows form. buatlah form seperti gambar diatas lalu ketikan coding di bawah ini :)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace sorting
{


    public partial class Form1 : Form
    {
        int y;
        int[] data;
        public Form1()
        {
            InitializeComponent();
        }

        private void BT_OK_Click(object sender, EventArgs e)
        {
            int[] data = new int[TXT_INPUT.Text.Length];

            for(int a=0; a<= data.Length-1;a++)
            {
            data[a] = int.Parse(TXT_INPUT.Text.Substring(a,1));
            }

            listView1.Items.Clear();
            for (int i = 0; i < data.Length; i++)
            {
                for (int j = 0; j < data.Length; j++)
                {
                    if (data[i] > data[j])
                    {
                        y = data[i];
                        data[i] = data[j];
                        data[j] = y;
                    }
                    string output = "";
                    for (int a = 0; a <= data.Length - 1; a++)
                    {
                        output += data[a].ToString();
                    }
                    listView1.Items.Add(output);

                }
            }

        }

        private void button1_Click(object sender, EventArgs e)
        {

            int[] data = new int[TXT_INPUT.Text.Length];

            for (int a = 0; a <= data.Length - 1; a++)
            {
                data[a] = int.Parse(TXT_INPUT.Text.Substring(a, 1));
            }

            LV_HASIL.Items.Clear();
            for (int i = 0; i < data.Length; i++)
            {
                for (int j = 0; j < data.Length; j++)
                {
                    if (data[i] < data[j])
                    {
                        y = data[i];
                        data[i] = data[j];
                        data[j] = y;
                    }
                    string output = "";
                    for (int a = 0; a <= data.Length - 1; a++)
                    {
                        output += data[a].ToString();
                    }
                    LV_HASIL.Items.Add(output);

                }

            }
        }


    }
}