Question

I have a custom C# user-control where I would like to draw a circle behind a textbox anchored to the centered bottom of the control. I’m drawing the circle like:

protected override void OnResize(EventArgs e)
{
   this.gp= new GraphicsPath();
   this.gp.AddEllipse(0,0,width,height); //this is the width and height of the control
   this.Region=new Region(this.gp);
   this.Refresh();
   base.OnResize (e);
}

protected override void OnPaint(PaintEventArgs pe)
{
   Color centerColor = Color.FromArgb(255,255,255,255);
   Color surroundColor = Color.FromArgb(255,255,255,255);
   PathGradientBrush br=new PathGradientBrush(this.gp);
   br.CenterColor=centerColor;
   br.SurroundColors=new Color[]{surroundColor};
   pe.Graphics.FillPath(br,this.gp);
}

I’ve added the textbox to the control in the GUI designer.

When I run this I end up with something like this:

How can I keep the ellipse behind the textbox?

Thanks,
Mark

Answer 1

If you want this in the background, do this in the “OnPaintBackground” override rather than in OnPaint. Then, when you want to draw it, invalidate the region the ellipse is in.