private void UpdateDisplay()
{
using (Brush selectedBrush = new SolidBrush(this._selectedColor))
{
this._graphics.DrawImage(this._colorImage, this._colorRectangle);
this._graphics.FillRectangle(this.AlphaBrush, this._selectedColorRectangle);
this._graphics.FillRectangle(selectedBrush, this._selectedColorRectangle);
this._graphics.DrawRectangle(Pens.Black, this._selectedColorRectangle);
this.DrawLinearGradient(this._fullColor);
this.DrawColorPointer(this._colorPoint);
this.DrawBrightnessPointer(this._brightnessPoint);
}
}