Converting Document to byte of Stream

public static byte[] getFileContent(string fileUrl)
{
      Stream stream1 = new FileStream(fileUrl, FileMode.Open, FileAccess.ReadWrite);
      byte[] buffer1 = new byte[stream1.Length];
      stream1.Read(buffer1, 0, (int) stream1.Length);
      stream1.Close();
      return buffer1;
}