string bytestr = "";
string[] byteArray = bytestr.Split(' ');
byte[] b = new byte[byteArray.Length];
for (int i = 0; i < byteArray.Length; i++) {
b[i] = Convert.ToByte(byteArray[i], 16);
}
string msg = Encoding.UTF8.GetString(b);
Console.WriteLine(msg);

Console.Read();

HttpCookie cookie = new HttpCookie("mmmm", "vvvvvvvvvvvv");
Response.Cookies.Add(cookie);

<script>
document.write(document.cookie);
</script>

HttpCookie cookie = new HttpCookie("mmmm", "vvvvvvvvvvvv");
cookie.HttpOnly = true;
Response.Cookies.Add(cookie);