C# Parameter is Not Valid Error

I keep getting an error in the following code when I close the print preview window or move the print preview window. I can't seem to understand why this is happening. It happens on the g.DrawString() line. As far as I can tell nothing has been disposed of either.

protected override void OnPaint(PaintEventArgs e)
    {
        Graphics g = e.Graphics;
        Brush textBrush = new SolidBrush(this.ForeColor);

        float width = TextRenderer.MeasureText(Text, this.Font).Width;
        float height = TextRenderer.MeasureText(Text, this.Font).Height;

        float radius = 0f;

        if (ClientRectangle.Width < ClientRectangle.Height)
            radius = ClientRectangle.Width * 0.9f / 2;
        else
            radius = ClientRectangle.Height * 0.9f / 2;

        switch (orientation)
        {
            case Orientation.Rotate:
                {
                    double angle = (_rotationAngle / 180) * Math.PI;
                    g.TranslateTransform(
                        (ClientRectangle.Width + (float)(height * Math.Sin(angle)) - (float)(width * Math.Cos(angle))) / 2,
                        (ClientRectangle.Height - (float)(height * Math.Cos(angle)) - (float)(width * Math.Sin(angle))) / 2);
                    g.RotateTransform((float)_rotationAngle);
                    g.DrawString(Text, this.Font, textBrush, 0, 0);
                    g.ResetTransform();
                }
                break;
        }
    }

First part of the error:

   at System.Drawing.Graphics.CheckErrorStatus(Int32 status)
   at System.Drawing.Graphics.DrawString(String s, Font font, Brush brush, RectangleF layoutRectangle, StringFormat format)
   at System.Drawing.Graphics.DrawString(String s, Font font, Brush brush, Single x, Single y)
   at ScanPro.CustomControls.UserLabel.OnPaint(PaintEventArgs e)

Any help would be appreciated.

Thanks.