how to manage shopping cart sessions without login

Hemant, I have solution for you, maybe it is correct for your requirement

Step 1: If someone adds a product in shopping cart, save a cookie in user browser, you can use javascript/jquery to save cookie in users browser

function createCookie(name,value,days) {
    var expires = "";
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days*24*60*60*1000));
        expires = "; expires=" + date.toUTCString();
    }
    document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}

function eraseCookie(name) {
    createCookie(name,"",-1);
}


$(document).ready(function(){

//Create Cookie for 1 year, when user add's a product
createCookie('ppkcookie','Unique_Guid',365);

//Save Cookie Unique_Guid in database, with product using ajax call

//getCookie
var x = readCookie('ppkcookie')
if (x) {
   // do something here, like load shopping cart products from database using ajax
}

})

Step 2: Save products in database with unique_id(if user add a product in cart), and fetch products from database where unique_id matches

Let me know if this work's for you, thanks

@Vikas's method should work if you can store data on client side, you can also store data on client side using javascript localstorage also.

You can also store cart details in C# sessions, here is the method step by step

1. Create a Model for Product
   

   public class Product {
    public string Id {get;set;}
    public string Name { get; set;}
    public double Price { get; set;}
    public string Photo { get;set;}
   }?

2. Create another Model for saving Item/product and it's quantity
   

   public class Item
   {
    public Product Product{get;set;}
    public int Quantity{get;set;}
   }?

3. Let's add the dummy data for Products
   

    public class ProductModel {
     private List <Product> products;
   
     public ProductModel() {
      this.products = new List < Product > () {
       new Product {
        Id = "p01",
         Name = "Name 1",
         Price = 5,
         Photo = "thumb1.gif"
       },
       new Product {
        Id = "p02",
         Name = "Name 2",
         Price = 2,
         Photo = "thumb2.gif"
       },
       new Product {
        Id = "p03",
         Name = "Name 3",
         Price = 6,
         Photo = "thumb3.gif"
       }
      };
     }
   
     public List <Product> findAll() {
      return this.products;
     }
   
     public Product find(string id) {
      return this.products.Single(p => p.Id.Equals(id));
     }
   
    }?

4. Now, create the C# controller function to add/remove  item from Cart with Session
   

   //id is product Id
    public ActionResult Buy(string id)
           {
               ProductModel productModel = new ProductModel();
               //check if session with cart is empty
               if (Session["cart"] == null)
               {
                   List<Item> cart = new List<Item>();
                   cart.Add(new Item { Product = productModel.find(id), Quantity = 1 });
                   Session["cart"] = cart;
               }
               // if Session["cart"] already have data
               else
               {
                   List<Item> cart = (List<Item>)Session["cart"];
                   int index = isExist(id);
                   if (index != -1)
                   {
                       cart[index].Quantity++;
                   }
                   else
                   {
                       cart.Add(new Item { Product = productModel.find(id), Quantity = 1 });
                   }
                   Session["cart"] = cart;
               }
               return RedirectToAction("Index");
           }
   
           public ActionResult Remove(string id)
           {
               List<Item> cart = (List<Item>)Session["cart"];
               int index = isExist(id);
               cart.RemoveAt(index);
               Session["cart"] = cart;
               return RedirectToAction("Index");
           }
   
           private int isExist(string id)
           {
               List<Item> cart = (List<Item>)Session["cart"];
               for (int i = 0; i < cart.Count; i++)
                   if (cart[i].Product.Id.Equals(id))
                       return i;
               return -1;
           }?

5. You can list Cart details in your View using Razor code as below
   

   <table cellpadding="2" cellspacing="2" border="1">
           <tr>
               <th>Option</th>
               <th>Id</th>
               <th>Name</th>
               <th>Photo</th>
               <th>Price</th>
               <th>Quantity</th>
               <th>Sub Total</th>
           </tr>
           @foreach (Item item in (List<Item>)Session["cart"])
           {
               <tr>
                   <td><a href="@Url.Action("Remove", "Cart", new { id = item.Product.Id })">Remove</a></td>
                   <td>@item.Product.Id</td>
                   <td>@item.Product.Name</td>
                   <td><img src="~/Content/Images/@item.Product.Photo" width="60" /> </td>
                   <td>@item.Product.Price</td>
                   <td>@item.Quantity</td>
                   <td>@(item.Product.Price * item.Quantity)</td>
               </tr>
           }
           <tr>
               <td align="right" colspan="6">Sum</td>
               <td>
                   @{
                       List<Item> cart = (List<Item>)Session["cart"];
                       var total = cart.Sum(item => item.Product.Price * item.Quantity);
                   }
                   @total
               </td>
           </tr>
       </table>?

Now, as you can see i am not saving any details in database and using Session["cart"] for saving details but I would like to advice you, use a Guid for saving details in cart like Sessaion["123456-67800"], where "123456-67800" is a Guid created using Guid.NewGuid(), and save this Guid in user's localStorage using javascript code

localStorage.setItem('CartGUID','123455-67800');

as soon as your E-commerce page is loaded check if there is any localStorage with CartGuid using javascript code

var cartGuid= localStorage.getItem('CartGUID');
if(cartGuid != null)
{
   //load partial view for above guid(123456-67800) cart
}

if there is already Guid created load items in your cart, that's it, you are done.