How to change the color of the edge of a GroupBox

[Alberto]

How to change the color of the edge of a Group-box?

Because I need to put a very clear background color...that is the edge of the Group-box q I have almost not appear because they are a very clear ash as well. ...

I needed to change to a darker color as I can't change the color of the background..

Does anyone have any suggestions???

[Demir]

Create the event below...

private void groupBox1_Paint(object sender, PaintEventArgs e)
    {
        GroupBox box = sender as GroupBox;
        DrawGroupBox(box, e.Graphics, Color.Red, Color.Blue, Collor.Yellow);
    }

And the method responsible for changing the color of the edge and text below...

private void DrawGroupBox(GroupBox box, Graphics g, Color textColor, Color borderColor, Color backgroundColor)
    {
        if (box != null)
        {
            Brush textBrush = new SolidBrush(textColor);
            Brush borderBrush = new SolidBrush(borderColor);
            Pen borderPen = new Pen(borderBrush);
            SizeF strSize = g.MeasureString(box.Text, box.Font);
            Rectangle rect = new Rectangle(box.ClientRectangle.X,
                                           box.ClientRectangle.Y + (int)(strSize.Height / 2),
                                           box.ClientRectangle.Width - 1,
                                           box.ClientRectangle.Height - (int)(strSize.Height / 2) - 1);
        // Coloque a cor do background aqui
        g.Clear(backgroundColor);

        // Draw text
        g.DrawString(box.Text, box.Font, textBrush, box.Padding.Left, 0);

        // Drawing Border
        //Left
        g.DrawLine(borderPen, rect.Location, new Point(rect.X, rect.Y + rect.Height));
        //Right
        g.DrawLine(borderPen, new Point(rect.X + rect.Width, rect.Y), new Point(rect.X + rect.Width, rect.Y + rect.Height));
        //Bottom
        g.DrawLine(borderPen, new Point(rect.X, rect.Y + rect.Height), new Point(rect.X + rect.Width, rect.Y + rect.Height));
        //Top1
        g.DrawLine(borderPen, new Point(rect.X, rect.Y), new Point(rect.X + box.Padding.Left, rect.Y));
        //Top2
        g.DrawLine(borderPen, new Point(rect.X + box.Padding.Left + (int)(strSize.Width), rect.Y), new Point(rect.X + rect.Width, rect.Y));
    }
}

Changes your GroupBox's Paint event to call the groupBox1_Paint.