Help with Chat Spammer Thing

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C#

I am trying to make a simple program that will take a very long string with about 100 words, and split them at spaces. My problem is that when I turn off my timer it keeps typing and won't turn off. Any ideas?

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

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

        private void button1_Click(object sender, EventArgs e)
        {
            timer1.Start();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            timer1.Stop();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            string s = "text here to type text text text";
            // Split string on spaces.
            // This will separate all the words.

            string[] words = s.Split(' ');
            foreach (string word in words)
            {
                SendKeys.Send(word);
                SendKeys.Send("{ENTER}");
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}