Hi try this
 
public byte[] ReadFile(string sPath)
    {
        byte[] data = null;
        FileInfo fInfo = new FileInfo(sPath);
        long numBytes = fInfo.Length;
        FileStream fStream = new FileStream(sPath, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fStream);
        data = br.ReadBytes((int)numBytes);
        return data;
    }
  byte[] imageData = ReadFile("F:/Ramesh/Imageresize/Images/imagesCAOFA7M5.jpg");