public Vote Vote(int id)
{
string Username = HttpContext.Current.Request["LOGON_USER"];
if (!Restaurants.Any(i => i.ID == id))
{
throw new Exception("No restaurant exists with that id.");
}
Restaurant Restaurant = Restaurants.First(i => i.ID == id);
var Vote = new Vote(Restaurant, Username);
if (this.Votes.Any(i => i.Username == Username && i.Timestamp >= DateTime.Today))
{
throw new Exception("You cannot vote twice per day.");
}
Votes.Add(Vote);
return(Vote);
}