C# Color.Equals() Color.ToArgb() 的小問題

Color tC;
Bitmap tBitmap ;

tBitmap = new Bitmap(100,100);

BitmapDrawLine(tBitmap, new Point(49,49), new Point(51,51), Color.Gold, 3.0);

tC =tBitmap.GetPixel(50, 50);

// right

if (tC.ToArgb() == Color.Gold.ToArgb()){

Console.Out.WriteLine("Find Gold");

// if( tC.Equals( Color.Gold) ){;}

// This will not work

//but currently don't know why 

}

public void BitmapDrawLine(Bitmap bM, Point sPoint, Point ePoint, Color lineColor,float lineThickness)
        {
            Graphics g = Graphics.FromImage(bM);
            Pen myPen = new Pen(lineColor, lineThickness);

            myPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;
            myPen.SetLineCap(System.Drawing.Drawing2D.LineCap.Round, System.Drawing.Drawing2D.LineCap.Round, System.Drawing.Drawing2D.DashCap.Round);

            g.DrawLine(myPen, sPoint, ePoint);
        }