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private const string MyAPIKey = "sfgsgsg";
    private const string MySecret = "xfvcvv";
    static string MyUserId = "cbxhb";
    Kite kite = new Kite(MyAPIKey, Debug: true);
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.QueryString["request_token"] != null)
        {
            string RequestToken = Convert.ToString(Request.QueryString["request_token"]);
            User user = kite.GenerateSession(RequestToken, MySecret);
            string MyAccessToken = user.AccessToken;
            string MyPublicToken = user.PublicToken;
            string UserId = "ZG6149";
            Ticker ticker = new Ticker(MyAPIKey, UserId, MyPublicToken);
            ticker.OnTick += OnTick;
            ticker.OnOrderUpdate += OnOrderUpdate;
            ticker.OnReconnect += OnReconnect;
            ticker.OnNoReconnect += OnNoReconnect;
            ticker.OnError += OnError;
            ticker.OnClose += OnClose;
            ticker.OnConnect += OnConnect;
            ticker.EnableReconnect(Interval: 5, Retries: 50);
            ticker.Connect();
            ticker.Subscribe(Tokens: new UInt32[] { 256265 });
            ticker.SetMode(Tokens: new UInt32[] { 256265 }, Mode: Constants.MODE_LTP);
            LblResult.Text = Utils.JsonSerialize(ticker);
        }
    }
    private static void initSession()
    {
        string RequestToken = Convert.ToString(HttpContext.Current.Session["REQUEST_TOKEN"]);
        Kite kite = new Kite(MyAPIKey, Debug: true);
        User user = kite.GenerateSession(RequestToken, MySecret);
        Console.WriteLine(Utils.JsonSerialize(user));
    }
    private static void initTicker()
    {
        string RequestToken = Convert.ToString(HttpContext.Current.Session["REQUEST_TOKEN"]);
        Kite kite = new Kite(MyAPIKey, Debug: true);
        string MyAccessToken = Convert.ToString(HttpContext.Current.Session["ACCESS_TOKEN"]);
        string MyPublicToken = Convert.ToString(HttpContext.Current.Session["PUBLIC_TOKEN"]);
        string UserId = "ZG6149";
        kite.SetAccessToken(MyAccessToken);
        Ticker ticker = new Ticker(MyAPIKey, UserId, MyPublicToken);
        ticker = new Ticker(MyAPIKey, MyAccessToken);
        ticker.OnTick += OnTick;
        ticker.OnReconnect += OnReconnect;
        ticker.OnNoReconnect += OnNoReconnect;
        ticker.OnError += OnError;
        ticker.OnClose += OnClose;
        ticker.OnConnect += OnConnect;
        ticker.OnOrderUpdate += OnOrderUpdate;
        ticker.EnableReconnect(Interval: 5, Retries: 50);
        ticker.Connect();
        
        ticker.Subscribe(Tokens: new UInt32[] { 256265 });
        ticker.SetMode(Tokens: new UInt32[] { 256265 }, Mode: Constants.MODE_LTP);
    }
    private static void OnTokenExpire()
    {
        Console.WriteLine("Need to login again");
    }
    private static void OnConnect()
    {
        Console.WriteLine("Connected ticker");
    }
    private static void OnClose()
    {
        Console.WriteLine("Closed ticker");
    }
    private static void OnError(string Message)
    {
        Console.WriteLine("Error: " + Message);
    }
    private static void OnNoReconnect()
    {
        Console.WriteLine("Not reconnecting");
    }
    private static void OnReconnect()
    {
        Console.WriteLine("Reconnecting");
    }
    private static void OnTick(Tick TickData)
    {
        Console.WriteLine("Tick " + Utils.JsonSerialize(TickData));
    }
    private static void OnOrderUpdate(Order OrderData)
    {
        Console.WriteLine("OrderUpdate " + Utils.JsonSerialize(OrderData));
    }                            
Also, you are creating a ticker object inside a function like this:
Ticker ticker = new Ticker(MyAPIKey, UserId, MyPublicToken);This ticker instance will get disposed immediately after the function execution is completed.
If you want a ticker running continuously in the server then you have to create a command line application. The example code given in the github repository is for that. Or you have to create a service that is not depended on page events.
PS: Do not post your App's credentials(api key, secret, tokens etc.) on the forum publicly. This may lead to unauthorised access.