public Form1()
{
    //InitializeComponent();

    this.Size = new Size(800, 600);

    Bitmap originalBmp = new Bitmap("neko.jpg");
    Bitmap bmp = new Bitmap(originalBmp, originalBmp.Width, originalBmp.Height);

    Panel panel = new Panel { Width = 400, Height = 300, Parent = this };

    int x = (panel.Width - originalBmp.Width) / 2;
    int y = (panel.Height - originalBmp.Height) / 2;
    const int delta = 10;

    panel.Paint += (o, e) =>
    {
        e.Graphics.DrawImage(bmp, x, y);
    };

    this.MouseDown += (o, e) =>
    {
        bmp = new Bitmap(originalBmp, bmp.Width + delta, bmp.Height + delta);
        x -= delta / 2;
        y -= delta / 2;
        panel.Invalidate();
    };
}