ADO.NET Asynchronous Calls

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

namespace TestADO
{
    public partial class Form1 : Form
    {
        SqlConnection con = new SqlConnection(@"Server=LAB-418-11-PC\STUDENT; Database=Test_DB; Integrated Security=true; Asynchronous Processing=true;");
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int id = Convert.ToInt32(textBox1.Text);
            string name = textBox2.Text;
            string surname = textBox3.Text;

            SqlCommand updateCommand = new SqlCommand("UPDATE Users SET name=N'" + name + "', surname=N'" + surname + "' WHERE id=" + id + "; WAITFOR DELAY 0:0:5; " + "UPDATE Users SET name=N'" + name + "', surname=N'" + surname + "' WHERE id=" + id, con);
            con.Open();

            IAsyncResult result = updateCommand.BeginExecuteNonQuery();

            while (!result.IsCompleted)
            {
                label1.Text = DateTime.Now.ToLongTimeString();
                System.Threading.Thread.Sleep(1000);
            }
        updateCommand.EndExecuteNonQuery(result);
            MessageBox.Show("Completed!");
            con.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string name = textBox2.Text;
            string surname = textBox3.Text;

            SqlCommand insertCommand = new SqlCommand("INSERT INTO Users (name, surname) OUTPUT INSERTED.id VALUES(N'" + name + "', N'" + surname + "')", con);
            con.Open();

            Object obj = insertCommand.ExecuteScalar();

            MessageBox.Show(obj.ToString());
            con.Close();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            SqlCommand procedureCall = new SqlCommand("dbo.averageOfId", con);
            procedureCall.CommandType = CommandType.StoredProcedure;
            con.Open();

            Object output = procedureCall.ExecuteScalar();

            MessageBox.Show(output.ToString());
            con.Close();
        }
    }
}