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I'm trying to make a shopping cart and I'm having trouble with adding an item to the shopping cart.

I'm trying to add items to the carts, but it seems that it is refreshing itself everytime I call the ShoppingCart part of the controller.

HomeController.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using ANON_Capstone.Models;

namespace ANON_Capstone.Controllers

public class HomeController : Controller

 private UsersContext db = new UsersContext();
 Carts carts = new Carts();

 public ActionResult Index()
 
 return View();
 

 public ActionResult About()
 
 return View();
 

 public ActionResult Contact()
 
 return View();
 

 public ActionResult Courses()
 

 return View(db.Courses.ToList());

 

 public ActionResult ShoppingCart(string className, string classPrice, string classID, string classDesc)
 
 if (carts.CartModels == null)
 
 carts.CartModels = new List<CartModel>();
 
 CartModel cart = new CartModel();
 cart.className = className;
 cart.classPrice = Convert.ToDouble(classPrice);
 cart.classID = Convert.ToInt32(classID);
 cart.classDesc = classDesc;

 //if (className != null)
 //
 // carts.CartModels.Add(new CartModel() className = className, classPrice = Convert.ToDouble(classPrice), classID = Convert.ToInt32(classID), classDesc = classDesc );
 //

 if (className != null)
 
 carts.CartModels.Add(new CartModel() className = className, classPrice = Convert.ToDouble(classPrice), classID = Convert.ToInt32(classID), classDesc = classDesc );
 

 //Session["Cart"] = cart;
 //ViewBag.Name = Session["Cart"] as ANON_Capstone.Models.Carts;
 //ViewData["Cart"] = cart;
 Console.WriteLine();
 return View(carts);
 

Courses.cshtml

@model IEnumerable<ANON_Capstone.Models.Course>

@if (!User.Identity.IsAuthenticated)

@section featured

 <section class="featured">
 <div class="content-wrapper">
 <h2 class="text-center">Please Login or Create an Account to make a Purchase!</h2>
 </div>
 </section>



<div class="row">
<div class="col-lg-9">
 <h2><strong>Courses</strong></h2><br />
 @foreach (var item in Model)
 
 <div class="col-md-4 col-xs-6 col-s-8 col-lg-4">
 @using (Html.BeginForm("ShoppingCart", "Home", FormMethod.Post))
 
 <img src="~/Images/party.gif" style="width: 175px" class="img-responsive" />
 <h2>@item.className</h2>
 <p>$@item.classPrice -- @item.maxStudent spots left! </p>
 <input type="text" name="className" value="@item.className" hidden="hidden" />
 <input type="text" name="classPrice" value="@item.classPrice" hidden="hidden" />
 <input type="text" name="classID" value="@item.ClassID" hidden="hidden" />
 <input type="hidden" name="classDesc" value="@item.classDesc" />
 if (User.Identity.IsAuthenticated)
 
 <input class="btn btn-default" type="submit" name="btnConfirm" value="Add to Shopping Cart" />
 
 
 <br />
 </div>
 
</div>
</div>

ShoppingCart.cshtml

@model ANON_Capstone.Models.Carts
@
 ViewBag.Title = "Shopping Cart";



<h2>Shopping Cart</h2>
@using (Html.BeginForm("ValidateCommand", "PayPal"))

<div class="row">
 <div class="col-lg-9">
 @if (Model.CartModels.Count != 0)
 
 <table border="1">
 <tr>
 <th>Course Image</th>
 <th>Course Name</th>
 <th>Course Desc</th>
 <th>Course Price</th>
 </tr>
 @foreach (var item in Model.CartModels)
 
 <tr>
 <td><img src="~/Images/party.gif" style="width: 175px" class="img-responsive" /></td>
 <td>@item.className</td>
 <td>@item.classDesc</td>
 <td>@item.classPrice</td>
 </tr>
 
 </table>
 <input class="btn btn-default" type="submit" name="btnConfirm" value="Check Out with Paypal" />
 

 else
 
 <text>Your shopping cart is currently empty</text>
 
 </div>


</div>

Carts.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;

namespace ANON_Capstone.Models

public class Carts

 public List<CartModel> CartModels get; set; 
 public double CartTotal get; set; 

CartModel.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;

namespace ANON_Capstone.Models

public class CartModel

 public string className get; set; 
 public double classPrice get; set; 
 public int classID get; set; 
 public string classDesc get; set; 

You are just creating new instances of Carts and CartsModel on every page call rather than loading them from the database.

Web-based applications are stateless, they don't remember variables across requests.

You'll need to write some code to persist and load your cart across multiple requests.

The solution is to involve your foreach in a "IF" block case and you'll escape your foreach from a new refresh.

@if(Model.CartModels != null)
foreach (var item in Model.CartModels)
 
 <tr>
 <td><img src="~/Images/party.gif" style="width: 175px" class="img-responsive" /></td>
 <td>@item.className</td>
 <td>@item.classDesc</td>
 <td>@item.classPrice</td>
 </tr>
 
 </table>
 <input class="btn btn-default" type="submit" name="btnConfirm" value="Check Out with Paypal" />
 

 else
 
 <text>Your shopping cart is currently empty</text>
 
}