Solved

Doing a shopping cart in ASP.NET

Posted on 2004-08-31
3
525 Views
Last Modified: 2013-11-29
Hi,

I have question about how to go about constructing a shopping cart in ASP.NET.  I understand c# and asp.net pretty well so my question is not one of how to do it it but one of design.

Is the best way to have the shopping cart this:

1)Create a DataTable and add each cart item to this datatable.
2)This DataTable is then stored in a Session variable and therefore passed around and can be seen on every page?

Is this good or bad?  

All help greatly appreciated as always!

Mike
0
Comment
Question by:hydev
3 Comments
 
LVL 1

Accepted Solution

by:
Cart_man earned 500 total points
ID: 11940354
I've done it like that and it works great.

What you need to do is creating a class that deals with all the main functions of that shopping cart, such as AddProduct, DeleteProduct, EmptyCart, etc.

Here is a class you can use:

using System;
using System.Data;
using System.Web;
using DAL;     // my own class for running queries against a database

namespace WebApp
{
      /// <summary>
      /// Summary description for Cart.
      /// </summary>
      public class Cart
      {
            public Cart()
            {
                  //
                  // TODO: Add constructor logic here
                  //
            }

            public static void AddToCart(int productId, int quant)
            {
                  DataTable dt = GetCart();
                  
                  DataRow rowFound = dt.Rows.Find(productId);
                  if (rowFound == null)
                  {
                        DataRow dr = dt.NewRow();
                        dr["product_id"]=productId;
                        dr["product_quant"]=quant;
                        dt.Rows.Add(dr);
                  }
                  else
                  {
                        rowFound["product_quant"]=Convert.ToInt32(rowFound["product_quant"]) + quant;
                  }

                  for (int i=0; i<dt.Rows.Count; i++)
                  {
                        string query = "select product_title, product_price from t_products where product_id=" + dt.Rows[i]["product_id"]; // this returns relevant data such as the product name and price to store in your datatable.
                        DataTable dtRes = DataLayer.GetDataTable(query, DataLayer.SqlConn);
                        dt.Rows[i]["product_name"]=dtRes.Rows[0]["product_title"];
                        dt.Rows[i]["product_price"]=dtRes.Rows[0]["product_price"];
                  }
                  HttpContext.Current.Session["shoppingCart"]=dt;
            }

            public static DataTable GetCart()  // returns the shopping cart as a datatable or creates a shopping cart if none is present.
            {
                  if (HttpContext.Current.Session["shoppingCart"]!=null)
                  {
                        DataTable dt = (DataTable)HttpContext.Current.Session["shoppingCart"];
                        return dt;
                  }
                  else
                  {
                        DataTable dt = new DataTable();
                        dt.PrimaryKey=new DataColumn[] {dt.Columns.Add("product_id")};
                        dt.Columns.Add("product_quant");
                        dt.Columns.Add("product_name");
                        dt.Columns.Add("product_price");
                        return dt;
                  }
            }

            public static bool IsInCart(int productId)   // returns whether a certain product is in the shopping cart
            {
                  DataTable dt = GetCart();
                  DataRow dr = dt.Rows.Find(productId);
                  return (dr!=null);
            }

            public static int GetTotalAmmount()   // returns the total ammount based on the price and quantity of each item
            {
                  DataTable dt = GetCart();
                  int total = 0;

                  for (int i=0; i<dt.Rows.Count; i++)
                  {
                        string query = "select product_price * " + dt.Rows[i]["product_quant"] + " as total from t_products where product_id=" + dt.Rows[i]["product_id"];
                        total+=Convert.ToInt32(DataLayer.GetDataTable(query, DataLayer.SqlConn).Rows[0]["total"]);
                  }

                  return total;
            }

            public static void UpdateCart(int productId, int productQuant)   // Modifies the quantity of a product in the cart
            {
                  DataTable dt = GetCart();
                  DataRow dr = dt.Rows.Find(productId);
                  dr["product_quant"]=productQuant;
            }

            public static void DeleteItem(int productId)   // deletes a product from the cart
            {
                  DataTable dt = GetCart();
                  DataRow dr = dt.Rows.Find(productId);
                  dr.Delete();
            }

            public static void IssueOrder()
            {

                                                // Write your own code to store the order in the database, send the confirmation to the customer, etc.


            }
      }
}
0
 
LVL 2

Expert Comment

by:anilmane
ID: 11940661
I thinks your question will get solve if you refer
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html/bdasamppet.asp

Thanks
Anil Mane
0
 
LVL 6

Expert Comment

by:Eric
ID: 11943340
take a look at the open source of a cart called MetaCart.  that should help ya out a bit..


http://metalinks.com/metacart/default.asp

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
WCAG (Web Content Accessibility Guidelines) levels 3 65
work allocation; web development; vba; access; 4 61
modify h2 4 80
Example unit tests with AngularJS 3 40
"In order to have an organized way for empathy mapping, we rely on a psychological model and trying to model it in a simple way, so we will split the board to three section for each persona and a scenario and try to see what those personas would Do,…
An enjoyable and seamless user experience can go a long way on an eCommerce site. While a cohesive layout and engaging copy play roles in creating a positive user experience, some sites neglect aspects that seem marginal but in actuality prove very …
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…
The viewer will get a basic understanding of what section 508 compliance can entail, learn about skip navigation links, alt text, transcripts, and font size controls.

932 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now