Problem with blips

[ArEcZeK363]

Hi I have problem with blips when my script is loaded and I start delivery work its create like 1458 blips. I don't have idea what's wrong here. Can somebody help me and explain what I did wrong?

using System;
using System.Windows.Forms;
using System.Drawing;
using GTA;
using GTA.Native;
using GTA.Math;
using GTA_V_Praca;

namespace GTA_V_Praca
{
    public class Main : Script
    {
        int workIndex = 0;
        bool workActive = true;
        static Blip mainBlip;
        static Vector3 createMainBlip = new Vector3(-195.4144f, -835.4664f, 30.72412f);
        Vehicle car;

        Blip destinationBlip;
        Vector3 destinationBlipPos = new Vector3(-2972.131f, 483.4448f, 15.42669f);

        Blip destinationBankBlip;
        Vector3 destinationBankBlipPos = new Vector3(-2957.326f, 480.4447f, 15.80684f);

        Blip bringBackCar;
        Vector3 bringBackCarPos = new Vector3(-178.5027f, -831.7009f, 30.4908f);

        public static void startWorkFunc()
        {
            UI.Notify("Mod Loaded");
            mainBlip = World.CreateBlip(createMainBlip);
            mainBlip.Sprite = (BlipSprite)408;
            mainBlip.Color = BlipColor.Yellow6;
            mainBlip.Name = "Praca";
            mainBlip.ShowRoute = false;
        }

        public void createDestinationBlip()
        {
            destinationBlip = World.CreateBlip(destinationBlipPos);
            if (destinationBlip.Exists())
            {
                destinationBlip.Color = BlipColor.Green2;
                destinationBlip.Sprite = (BlipSprite)207;
                destinationBlip.Name = "Cel";
                destinationBlip.ShowRoute = true;
            }
        }

        public void createDestinationBankBlip()
        {
            destinationBankBlip = World.CreateBlip(destinationBankBlipPos);
            if (destinationBankBlip.Exists())
            {
                destinationBankBlip.Color = BlipColor.Yellow4;
                destinationBankBlip.Sprite = (BlipSprite)1;
                destinationBankBlip.Name = "Cel";
                destinationBankBlip.ShowRoute = false;
            }
        }

        public void createBringBackCarBlip()
        {
            bringBackCar = World.CreateBlip(bringBackCarPos);
            if (bringBackCar.Exists())
            {
                bringBackCar.Color = BlipColor.Red;
                bringBackCar.Sprite = (BlipSprite)50;
                bringBackCar.Name = "Cel";
                bringBackCar.ShowRoute = true;
            }
        }

        public Main()
        {
            startWorkFunc();
            Tick += onTick;
            KeyDown += onKeyDown;
        }

        private void onTick(object sender, EventArgs e)
        {
            if (workActive)
            {
                switch (workIndex)
                {
                    case 0:
                        {
                            Vector3 spawnCarPos = new Vector3(-180.9704f, -838.5579f, 30.16903f);
                            World.DrawMarker(MarkerType.VerticalCylinder, createMainBlip, new Vector3(0f, 0f, 0f), new Vector3(0f, 0f, 0f), new Vector3(1.5f, 1.5f, 0.3f), Color.FromArgb(255, 200, 0));
                            if (Game.Player.Character.Position.DistanceTo(createMainBlip) < 1.5)
                            {
                                Main.displayHelpTextThisFrame("Naciśnij ~INPUT_CONTEXT~, żeby wyjąć pojazd.");
                                if (Game.IsEnabledControlJustPressed(2, GTA.Control.Context))
                                {
                                    car = World.CreateVehicle(VehicleHash.Stockade, spawnCarPos, 160.7435f);
                                    Blip carBlip = car.AddBlip();
                                    carBlip.Sprite = (BlipSprite)477;
                                    carBlip.Color = BlipColor.Blue;
                                    Game.Player.Character.SetIntoVehicle(car, VehicleSeat.Driver);
                                    workIndex = 5;
                                }
                            }
                            break;
                        }
                    case 5:
                        {
                            if (Game.Player.Character.IsInVehicle(car) || Game.Player.Character.IsSittingInVehicle(car))
                            {
                                workIndex = 10;
                            }
                            else
                            {
                                UI.ShowSubtitle("Wsiądź do pojazdu");
                            }
                            break;
                        }
                    case 10:
                        {
                            createDestinationBlip();
                            World.DrawMarker(MarkerType.VerticalCylinder, destinationBlipPos, new Vector3(0f, 0f, 0f), new Vector3(0f, 0f, 0f), new Vector3(5f, 5f, 2.2f), Color.FromArgb(255, 255, 0));
                            UI.ShowSubtitle("Zawieź worki z pieniędzmi do banku Fleeca.");
                            if (car.Position.DistanceTo(destinationBlipPos) < 5f)
                            {
                                destinationBlip.Remove();
                                workIndex = 15;
                            }
                            break;
                        }
                    case 15:
                        {
                            createDestinationBankBlip();
                            UI.ShowSubtitle("Zanieś worki z pieniędzmi na zaplecze banku.");
                            World.DrawMarker(MarkerType.VerticalCylinder, destinationBankBlipPos, new Vector3(0f, 0f, 0f), new Vector3(0f, 0f, 0f), new Vector3(1f, 1f, 0.3f), Color.FromArgb(255, 200, 0));
                            if (Game.Player.Character.Position.DistanceTo(destinationBankBlipPos) < 0.5f)
                            {
                                UI.ShowSubtitle("Odłóż worki z pieniędzmi.");
                                Main.displayHelpTextThisFrame("Naciśnij ~INPUT_CONTEXT~, żeby odłożyć worki.");
                                if (Game.IsControlJustPressed(2, GTA.Control.Context))
                                {
                                    destinationBankBlip.Remove();
                                    workIndex = 20;
                                }
                            }
                            break;
                        }
                    case 20:
                        {
                            UI.Notify("Odkładanie worków...");
                            Game.Player.Character.FreezePosition = true;
                            Wait(3000);
                            Game.Player.Character.FreezePosition = false;
                            workIndex = 35;
                            break;
                        }
                    case 35:
                        {
                            Main.chooseRandomReward();
                            workIndex = 40;
                            break;
                        }
                    case 40:
                        {
                            createBringBackCarBlip();
                            World.DrawMarker(MarkerType.VerticalCylinder, bringBackCarPos, new Vector3(0f, 0f, 0f), new Vector3(0f, 0f, 0f), new Vector3(5f, 5f, 2.2f), Color.FromArgb(255, 200, 0));
                            UI.Notify("Odstaw pojazd");
                            if (car.Position.DistanceTo(bringBackCarPos) < 5f)
                            {
                                car.Delete();
                                workIndex = 0;
                            }
                            break;
                        }
                }
            }
        }

        private void onKeyDown(object sender, KeyEventArgs e)
        {

        }

        public static void displayHelpTextThisFrame(string text)
        {
            Function.Call(Hash._SET_TEXT_COMPONENT_FORMAT, "STRING");
            Function.Call(Hash._ADD_TEXT_COMPONENT_STRING, text);
            Function.Call(Hash._0x238FFE5C7B0498A6, 0, 0, 1, -1);
        }

        public static void chooseRandomReward()
        {
            int randomMoney = Function.Call<int>(Hash.GET_RANDOM_INT_IN_RANGE, 500, 1500);
            Game.Player.Money += randomMoney;
            UI.Notify("You earned ~g~$" + randomMoney);
        }

        public static int GetRandomFromRange(int a, int b)
        {
            var rnd = new Random(DateTime.Now.Millisecond);
            int rs = rnd.Next(a, b);
            return rs;
        }
    }
}