How to fix a rectangle to the borders of the form

Question

I think I'm not clear, but I am practicing doing some pictures on a form. It's very simple code so I think it's not worth it to post it.

I want to draw some semi-transparent rectangles close to the borders of the form, which I have already managed to do. The problem is that when I re-size the form the rectangles just stay at their original positions, and don't "follow" the new position of the borders.

Answer 1

Make sure to do your drawing in the form's Paint event. That way, it will happen each time the control is redrawn: on a resize for example.

Here's a good example: http://msdn.microsoft.com/en-us/library/system.windows.forms.control.paint.aspx

public MyForm() 
{
    this.Paint += this.PaintRectangles;
}

private void PaintRectangles(object sender, PaintEventArgs e)
{
    // use e.Graphics to draw stuff
}