Is this the fastest way to access the RGB values of a Pixel ?

[C# Programming]

End Google Ads 201810 - BS.net 01 --> is this the fastest way to access the RGB values of a pixel of a bitmap file in c#?
the code is below
bm is previously declared Bitmap object.
Collapse

BitmapData bmd=bm.LockBits(new Rectangle(0, 0, 10, 10), System.Drawing.Imaging.ImageLockMode.ReadOnly, bm.PixelFormat);
int PixelSize=4;

for(int y=0; y