Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
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    public partial class Form1 : Form
    {
        Timer t;
        public Form1()
        {
            InitializeComponent();

            t = new Timer();
            t.Interval = 1000;
            t.Tick += new EventHandler(t_Tick);
            t.Enabled = true;
        }

        Random r = new Random();

        void t_Tick(object sender, EventArgs e)
        {
            this.pictureBox1.BackColor = Color.FromArgb(r.Next(255),
r.Next(255), r.Next(255));
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            Bitmap
img=(Bitmap)Image.FromStream(this.GetType().Assembly.GetManifestResourceStream("pbbackcolor.Bitmap1.bmp"));
            img.MakeTransparent(Color.Magenta);

            this.pictureBox1.Image = img;

        }