int i = 0;
        Form2 frm;
        public Form1()
        {
            InitializeComponent();
            timer1.Enabled = true;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            this.textBox1.Text = "Timer ticked event called " + i + " times";
            i++;

            if (frm != null)
                frm.textBox1.Text = this.textBox1.Text;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            frm = new Form2();
            frm.textBox1.Text = this.textBox1.Text;
            frm.Show();
        }