System.Drawing.SolidBrush.Dispose C# (CSharp) Метод

        public override void Dispose(bool disposing)
        {
            if (disposing){
            }
        }

        /// <summary>
        /// 主要作業方法
        /// </summary>
        public Image Operation()
        {
            Graphics g = Graphics.FromImage(image);
            _mask_pos_x = (image.Width / 2) + _Xoffset;
            SizeF steSize = new SizeF();
            for (int i = _FontMaxSize; i >= _FontMinSize; i--)
            {
                using (Font testFont = new Font(_FontFamily, i, FontStyle.Bold))
                {
                    steSize = g.MeasureString(_text, testFont);

                    if ((ushort)steSize.Width < (ushort)_Width || i == _FontMinSize)
                    {

                        using (SolidBrush semiTransBrush = new SolidBrush(_fontcolor))
                        {
                            StringFormat StrFormat = new StringFormat();
                            StrFormat.Alignment = StringAlignment.Center;
                            g.DrawString(_text, testFont, semiTransBrush, new PointF(_mask_pos_x, _mask_pos_y), StrFormat);
                            semiTransBrush.Dispose();
                        }
                        testFont.Dispose();
                        break;
                    }
                }
            }

            return image;
        }