1. Shopping Cart Demo

2. Shopping Cart Search and display product information Add item to cart
Delete item from cart
View cart contents
Change quantities of a cart item
Check out
Note: Project: ShopCart

3. Shopping Cart Example Database: OrderID: SessionID
WebCustomer: CustID, CustName, Addr, Phone,
WebOrder: OrderID, CustID, OrderDate, CreditCardType, CreditCardNo
WebLine: OrderID, PID, Qty
WebProduct: Pid, Pname, Price, UnitsInStock
OrderID: SessionID
Login user using cookie

4. Implementing Shopping Cart as Class
Shopping Cart Properties:
public string oid;
public string cid;
public DateTime ODate;
public string CreditCardType;
public string CreditCardNo;
public List<CartLine> detailLines = new List<CartLine>();
public double CartTotal **** Read only calculated property
Methods: AddItem, DeleteItem, ViewCart, CheckOut
DetailLine Properties:
OID
PID
Pname
Price
Qty
Amount = Qty * Price **** read only calculated property

5. Adding a Class to a Website
Project/Add Class

6. ShopCart Class Properties
public string oid { get; set; }
public string cid { get; set; }
public DateTime ODate { get; set; }
public string CreditCardType { get; set; }
public string CreditCardNo { get; set; }
public List<CartLine> detailLines = new List<CartLine>();
public double CartTotal
{ get
{ double total=0;
foreach (CartLine item in detailLines)
{ total+=item.amount; }
return total;
} }

7. AddItem Method public void AddItem(CartLine line) {
Boolean incart=false;
if (detailLines.Count>0)
foreach(CartLine item in detailLines)
if (item.pid==line.pid)
item.qty=line.qty;
incart=true;
break; }
if (incart==false)
detailLines.Add(line);

8. public void deleteItem(int deleteIndex){
detailLines.RemoveAt(deleteIndex); }
public void checkOut()
string strConn = "Data Source=(localdb)\\projects;Initial Catalog=SalesDB;Integrated Security=True";
SqlConnection objConn = new SqlConnection(strConn);
string strSQL = "insert into weborder values ('" + oid + "','" + cid + "','" + ODate.ToString() + "','" + CreditCardType + "','" + CreditCardNo + "')";
SqlCommand objComm = new SqlCommand(strSQL,objConn);
objConn.Open();
objComm.ExecuteNonQuery();
foreach(CartLine objLine in detailLines)
strSQL = "insert into webline values ('" + objLine.oid + "','" + objLine.pid + "'," + objLine.qty.ToString() + ")";
objComm.CommandText = strSQL;
objConn.Close(); }

9. CartLine Class { public string oid { get; set; }
public class CartLine {
public string oid { get; set; }
public string pid { get; set; }
public string pname { get; set; }
public double price { get; set; }
public double qty { get; set; }
public double amount {
get {return qty*price;}} }

10. Home Page Reading cookie: ViewProduct button event:
protected void Page_Load(object sender, EventArgs e) {
String CID;
CID = Request.Cookies["CID"].Value;
Session["CID"] = CID; }
ViewProduct button event:
ShopCart MyCart = new ShopCart();
MyCart.oid = Session.SessionID;
MyCart.cid = (string)Session["CID"];
Session["MyCart"] = MyCart;
Response.Redirect("ViewProduct.aspx");

11. ViewProduct PageLoad event
DataSet objDataSet = new DataSet();
ShopCart MyCart = new ShopCart();
protected void Page_Load(object sender, EventArgs e) {
string strConn = "Data Source=(localdb)\\projects;Initial Catalog=SalesDB;Integrated Security=True";
SqlConnection objConn = new SqlConnection(strConn);
string strSQL = "select * from WebProducts;";
SqlDataAdapter objAdapter = new SqlDataAdapter(strSQL,strConn);
if (!Page.IsPostBack)
objAdapter.Fill(objDataSet, "WebProducts");
Session["MyDs"]= objDataSet; }
else
MyCart = (ShopCart)Session["MyCart"];
objDataSet = (DataSet)Session["MyDs"];

12. Price Radiobutton Event
DataView objDataView = new DataView();
objDataView = objDataSet.Tables["WebProducts"].DefaultView;
objDataView.RowFilter = "price " + RadioButtonList1.SelectedValue.ToString();
GridView1.DataSource = objDataView;
GridView1.DataBind();

13. AddToCart Event CartLine objLine = new CartLine();
MyCart = (ShopCart)Session["MyCart"];
objLine.oid = MyCart.oid;
objLine.pid = GridView1.SelectedRow.Cells[0].Text;
objLine.pname = GridView1.SelectedRow.Cells[1].Text;
objLine.price = double.Parse(GridView1.SelectedRow.Cells[2].Text);
TextBox t = (TextBox)(GridView1.SelectedRow.Cells[4].Controls[1]);
objLine.qty = double.Parse(t.Text);
MyCart.AddItem(objLine);
Response.Write("number of items in cart:" MyCart.detailLines.Count.ToString());
Session["MyCart"] = MyCart;

14. ViewCart event DeleteLine event: ShopCart MyCart = new ShopCart();
protected void Page_Load(object sender, EventArgs e) {
MyCart =(ShopCart) Session["MyCart"];
GridView1.DataSource = MyCart.detailLines;
GridView1.DataBind();
TextBox1.Text = MyCart.CartTotal.ToString("C"); }
DeleteLine event:
MyCart.deleteItem(e.RowIndex);
Session["MyCart"] = MyCart;
GridView1.DataSource = MyCart.detailLines;
GridView1.DataBind();
TextBox1.Text = MyCart.CartTotal.ToString("C");

15. CheckOut Procedure ShopCart MyCart = new ShopCart();
protected void Page_Load(object sender, EventArgs e) {
MyCart = (ShopCart) Session["MyCart"]; }
protected void Button1_Click(object sender, EventArgs e)
MyCart.ODate = DateTime.Now;
MyCart.CreditCardType = RadioButtonList1.SelectedValue.ToString();
MyCart.CreditCardNo = TextBox1.Text;
MyCart.checkOut();
Response.Write("<p align='center'><font size='5'><b>Thank you for shopping at My.Com</b></font></p>");
Session.Abandon();

16. Cookies

17. Data in Cookies System.Web
Which web site set the cookie
Expiration date
DateTime data type
TimeSpan data type
One or more pieces of data
Keys: A collection of cookie’s names
Define a new cookie:
HttpCookie cookieCID = new HttpCookie("CID");
Write cookie to user: Response.Cookies.Add(cookieCID);

18. Cookie’s Properties Properties To write a cookie: Name Value Expires
Response.Cookies.Add(cookieObj)

19. Creating Cookies DateTime dt; dt=DateTime.Now;
TimeSpan ts = new TimeSpan(30,0,0,0);
HttpCookie cookieCID = new HttpCookie("CID");
HttpCookie cookieCname = new HttpCookie("Cname");
cookieCID.Value = Login1.UserName;
cookieCID.Expires = dt.Add(ts);
Response.Cookies.Add(cookieCID);
Note: The name(or key)of cookieCID is "CID";

20. Reading Cookies Response.Write(Request.Cookies["CID"].Name);
Response.Write(Request.Cookies["CID"].Value);

21. Using Cookie with DataReader
string strConn = "Data Source=(localdb)\\projects;Initial Catalog=SalesDB;Integrated Security=True";
SqlConnection objConn = new SqlConnection(strConn);
String CID;
CID = Request.Cookies["CID"].Value;
string strSQL = "select * from webcustomer where CustID= '" + CID + "'";
SqlCommand objComm = new SqlCommand(strSQL, objConn);
SqlDataReader objDataReader;
objConn.Open();
objDataReader = objComm.ExecuteReader();
if (objDataReader.Read()) {
Session["Cname"] = objDataReader["CustName"];
Response.Write("<hr>Welcome:" + objDataReader["CustName"] + "<hr>"); }
else
Response.Write("<hr>We don't have your record <hr>");
objConn.Close();