picture box

The best way to do this is to simply draw the image directly over the form by overriding the OnPaint event:

Show here example

public class Form1
{

    private Bitmap _myImage = new Bitmap("C:\\myImage.gif");

    protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
    {
        base.OnPaint(e);

        e.Graphics.DrawImageUnscaled(new Bitmap(_myImage), 100, 100);
    }
}

OR you can try this code sample Transparent label above a picturebox


protected override void OnPaint(PaintEventArgs e)
{

    gxOff = e.Graphics;

}

private void pbx_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{

    Graphics g = e.Graphics;

    DrawLabel(lblPag1, g);

}

private void DrawLabel(Label lbl, Graphics grx)
{

    Rectangle rect;

    if (lbl.TextAlign == ContentAlignment.TopLeft) {

        gxOff.DrawString(lbl.Text, lbl.Font, new SolidBrush(lbl.ForeColor), lbl.Location.X, lbl.Location.Y);
    }

    else if ((lbl.TextAlign == ContentAlignment.TopCenter)) {

        SizeF size;

        size = grx.MeasureString(lbl.Text, lbl.Font);

        int Left;

        Left = (this.Width / 2) - ((int)size.Width / 2);

        rect = new Rectangle(Left, lbl.Top, (int)size.Width, (int)lbl.Height);

        gxOff.DrawString(lbl.Text, lbl.Font, new SolidBrush(lbl.ForeColor), rect.Location.X, rect.Location.Y);

        pbx.Visible = false;
    }

    else if (lbl.TextAlign == ContentAlignment.TopRight) {

        SizeF size;

        size = grx.MeasureString(lbl.Text, lbl.Font);

        int Left;

        Left = lbl.Width - (int)size.Width + lbl.Left;

        rect = new Rectangle(Left, lbl.Top, (int)size.Width, (int)lbl.Height);

        gxOff.DrawString(lbl.Text, lbl.Font, new SolidBrush(lbl.ForeColor), rect.Location.X, rect.Location.Y);

    }

}