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private void panal1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)

{

    e.Graphics.DrawRectangle(

        Pens.Gainsboro,

        e.ClipRectangle.Left,

        e.ClipRectangle.Top,

        e.ClipRectangle.Width - 1,

        e.ClipRectangle.Height - 1);

    base.OnPaint(e);

}

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