Rendezés - UNCOMPLETE

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Linq;

namespace Rendezés
{
    /// <summary>
    /// Description of MainForm.
    /// </summary>
    public partial class MainForm : Form
    {

        public int[] generalas = new int[15];
        public int[] arr = new int[15];
        public int[] ordered = new int[15];
        public Random randNum = new Random();
        public int temp = 0;

        public MainForm()
        {
            InitializeComponent();

        }
        void Button1_generalClick(object sender, EventArgs e)
        {

            for (int i = 0; i < generalas.Length; i++) {
                generalas[i] = randNum.Next(0, 15);
            }

            foreach (var i in generalas) {
            //  generalas[i] = randNum.Next(1, 15);
                richTextBox1_general.AppendText(generalas[i].ToString());
                richTextBox1_general.AppendText(Environment.NewLine);
            }



        }
        void Button1_buborekClick(object sender, EventArgs e)
        {

        int temp = 0;

        foreach (var i in arr) {
            arr[i] = generalas[i];
        }

        for (int write = 0; write < arr.Length; write++) {
             for (int sort = 0; sort < arr.Length - 1; sort++) {
              if (arr[sort] > arr[sort + 1]) {
                    temp = arr[sort + 1];
                    arr[sort + 1] = arr[sort];
                 arr[sort] = temp;
                   }
                  }
                }
        foreach (var i in arr) {
                richTextBox1_sorba.AppendText(arr[i].ToString());
                richTextBox1_sorba.AppendText(Environment.NewLine);
        }

        }
        void Button1_minClick(object sender, EventArgs e)
        {

                Array.Sort(generalas);

                foreach (var i in generalas) {
                richTextBox1_sorba.AppendText(generalas[i].ToString());
                richTextBox1_sorba.AppendText(Environment.NewLine);
            }
        }
    }
}