image viewer stuff

private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void button_showPicture_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Load(openFileDialog1.FileName);
            }
        }

        private void button_setbg_Click(object sender, EventArgs e)
        {
            if (colorDialog1.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.BackColor = colorDialog1.Color;
            }
        }

        private void button_clear_Click(object sender, EventArgs e)
        {
            pictureBox1.Image = null;
        }

        private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
        {

        }

        private void checkBox_stetch_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox_stretch.Checked)
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
            else
                pictureBox1.SizeMode = PictureBoxSizeMode.Normal;
        }
    }