public partial class Form1 : Form
    {
        Media.VideoPlay video = new Media.VideoPlay();
        Media.VideoPlay video2 = new Media.VideoPlay();
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.openFileDialog1.ShowDialog();
            video.VideoName = this.openFileDialog1.FileName;
            video.PlayVideo(video.VideoName, this.pictureBox1);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.openFileDialog1.ShowDialog();
            video2.VideoName = this.openFileDialog1.FileName;
            video2.PlayVideo(video2.VideoName, this.pictureBox2);
        }
    }