'System.ArgumentException' occurred in System.Drawing.dll

Question

I have simple application like "paint", I draw in a bitmap which is set to the pictureBox.Image. I can draw here polygons and catch them on the vertices and move, so the bitmap must be repaint. There is the repaint method.

private void DrawFullList()
    {
        if(pictureBox2.Image != null)
            pictureBox2.Image.Dispose();
        graphic = new Bitmap(pictureBox2.Width, pictureBox2.Height); // exception here
        g = Graphics.FromImage(graphic);
        pictureBox2.Image = graphic;
        for (int i = 0; i < PointsList.Count; i++)
        {
            bool yellowframe = false;
            if (i == dblclck)
                yellowframe = true;
            Draw(BrushList[i], PointsList[i], yellowframe);
        }
    }

So if I catch vertice and move mouse, the function DrawFullList() is activated in the pictureBox_MouseMove(object sender, MouseEventArgs e) function. When I move the one vertice for few second (for example, making circles) The exception 'System.ArgumentException' occurred in System.Drawing.dll is thrown. Any tips here? :)

Edit: additional info about exception: parameter is invalid

Answer 1

You should dispose from g - g.dispose() to free memory. Lack of memory can cause such a exception because your bmp may be too big for actually free memory.