bitmapとbyte[]間の相互変換

C#BitmapタイプとByte[]タイプの相互変換

Bitmap   b   =   new   Bitmap( "test.bmp "); 
 MemoryStream   ms   =   new   MemoryStream(); 
 b.Save(ms,System.Drawing.Imaging.ImageFormat.Bmp); 
 byte[]   bytes=   ms.GetBuffer();  //byte[]   bytes=   ms.ToArray();  ， ， 
ms.Close(); 

byte[]   bytelist=bytes; 
 MemoryStream   ms1   =   new   MemoryStream(bytelist); 
 Bitmap   bm   =   (Bitmap)Image.FromStream(ms1); 
 ms1.Close();