Runtine array

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 WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        int[] kunder;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int tal = 5;
            kunder = new int[tal];
            kunder[3] = kunder[3] + 1;
            label1.Text = kunder[3].ToString();
        }
    }
}