copy data from bitmap array into new array store data of bmp

Question

I work on bitmap i read header of bmp 24 bit per pixel ,width 320 height 240,offset start of image data in location 54,use c#

in location 54 in bmp array i access to data ,i store data in new array :

struct pix //structure for pixel in bmp image

{

public byte r;//Red

public byte g;//Green

public byte b;//Blue

};

Bitmap img = new Bitmap(opendialog1.FileName);

string filename = opendialog1.FileName;

byte[] bmp = File.ReadAllBytes(filename);

int i=54;

pix[ , ] bmpdata = new pix[img.Height, img.Width]; //create array of structure

for (int row = 0; row < img.Height; row++)

{

for (int col = 0; col < img.Width; col++)

{

bmpdata[row, col].r = bmp[i];

bmpdata[row, col].g = bmp[i + 1];

bmpdata[row, col].b = bmp[i + 2];

i += 3;

}

is this correct method for copy data from bmp array into new array for data only ,i use c# window form ?