C# code runs well on debug, but crashes otherwise
<p>I'm very beginner with C# and I wanted to create function that prints random numbers to do prank to my friend.
This code of mine works well when I use debug mode but when I build it or run it without debug, it crashes after a while. Can you guys help me out? Thanks</p>

<pre><code>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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Cursor.Hide();
            Random random = new Random();
            while(true)
            {            
                int satunnainen = random.Next(1000, 9999);
                label1.Text = label1.Text + satunnainen.ToString() + " ";
                satunnainen = 0;
                label1.Update();
            }
        }
    }
}
</code></pre>
