public Tuple <bool, string> subscribe(string username, int storeID)
{
LinkedList <string> users;
if (!StoreSubscribers.TryGetValue(storeID, out users))
{
users = new LinkedList <string>();
users.AddFirst(username);
StoreSubscribers.Add(storeID, users);
return(new Tuple <bool, string>(true, ""));
}
if (users.Contains(username))
{
return(new Tuple <bool, string>(true, "User Already Subscribed to this store"));
}
users.AddFirst(username);
StoreSubscribers[storeID] = users;
return(new Tuple <bool, string>(true, ""));
}
