How to move the direction of picturebox to left after touching the end of the form

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C#3.5

Iam trying to develop at game like bal bat game,i want the picturebox to move to left,iam able to move it top to bottom and also right,i want it to move to left direction, the controls what i used are picturebox as ball,label as bat and 2 timer controls .

code :-

private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            int i = (int)e.KeyCode;
            if (i == 37 && label1.Left > 0)
                label1.Left = label1.Left - 3;
            if (i == 39 && label1.Left < this.Width - label1.Width)
                label1.Left = label1.Left + 3;
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            pictureBox1.Top = pictureBox1.Top - 5;
            if (pictureBox1.Top < 0)
            {
                timer1.Enabled = false;
                timer2.Enabled = true;
            }
        }

        private void timer2_Tick(object sender, EventArgs e)
        {
            pictureBox1.Top = pictureBox1.Top + 5;
            pictureBox1.Left = pictureBox1.Left + 2;
            if(label1.Top == pictureBox1.Top && pictureBox1.Left > label1.Left && pictureBox1.Left < label1.Right)
            {
                timer1.Enabled = true;
                timer2.Enabled = false;
                
            }
        }