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Код

namespace WindowsApplication19
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            for (int i = 0; i < 30; i++)
                Threads[i] = new Thread(new ThreadStart(Proc));
        }

        private string chars = "abcdefghijklmnopqrstuvwxyz";
        Thread[] Threads = new Thread[30];

        private string RandomString()
        {
            string line = "";

            Random rand = new Random();
            for (int i = 0; i < 8; i++)
                line += chars[rand.Next(0, chars.Length)];

            return line;
        }

        private void Regisration()
        {
            lock (this)
            {
                string Login = "", Password = "";

                Login = RandomString();
                Password = RandomString();

                listBox1.Items.Add(Login + "@mail.ru;" + Password);
            }
        }

        private void Proc()
        {
            while (true)
            {
                Regisration();
                Thread.Sleep(2000);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < 30; i++)
                Threads[i].Start();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < 30; i++)
                Threads[i].Abort();
        }
    }
}