c# bitmap into picturebox

Question

`

    public Bitmap catchFullScreen()
    { Bitmap r = new Bitmap(SystemInformation.VirtualScreen.Width ,SystemInformation.VirtualScreen.Height);
        Rectangle bounds = new Rectangle (0,0,SystemInformation.VirtualScreen.Width ,SystemInformation.VirtualScreen.Height);
        using (Bitmap bitmap = new Bitmap(SystemInformation.VirtualScreen.Width ,SystemInformation.VirtualScreen.Height))
        {
            using (Graphics g = Graphics.FromImage(bitmap))
            {
                g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
                r = bitmap;
                pictureBox1.Image = r;
                pictureBox1.Update();
                pictureBox1.Refresh();
            }
            pictureBox2.Image = r; // breakpoint 1 
            pictureBox2.Update();  // breakpoint 2
            pictureBox2.Refresh();
        }
        pictureBox3.Image = r;
        pictureBox3.Update();
        pictureBox3.Refresh();
        return r;
    }

` Here is my capture screenshot, but something strange is going on, picturebox1 and 2 is able to capture , but picturebox3 does not. further more, breakpoint1 works but breakpoint2 never arrives,

Why cant i use this bitmap after i am outside the using routines?? more important it wont return r? suggestions please!

Answer 1

Bitmap is a class, that is a reference type. When you dispose bitmap you also dispose your r . If you want to continue using r while disposing bitmap , consider using something like Bitmap.Clone .