Build a Shopping Cart by use C# work in asp.net—end in this post

Now to create Products page, add a new webform and name it Products.aspx, add sqldataSource and configure it for select statement,
Add a DataList Control on the page and make SqlDataSource1 it’s source.
Configure Datalist according to below mentioned source

<form id=”form1″ runat=”server”>

<asp:ScriptManager ID=”ScriptManager1″ runat=”server” />

<div>

<asp:SqlDataSource ID=”SqlDataSource1″ runat=”server”

ConnectionString=”<%$ ConnectionStrings:ConnectionString %>”

SelectCommand=”SELECT [ProductID], [Name], [Description],

[Price], [ImageUrl] FROM [Products]”>

</asp:SqlDataSource>

</div>

 

<asp:DataList ID=”DataList1″ runat=”server”

DataSourceID=”SqlDataSource1″

RepeatColumns=”4″

RepeatDirection=”Horizontal”>

<ItemTemplate>

<asp:ImageButton ID=”ImageButton1″ runat=”server”

ImageUrl='<%# Eval(“ImageUrl”, “Images\\thumb_{0}”) %>’

PostBackUrl='<%# Eval(“ProductID”,

“ProductDetails.aspx?ProductID={0}”) %>’ />

<br />

<asp:Label ID=”NameLabel” runat=”server”

Text='<%# Eval(“Name”) %>’>

</asp:Label>

<asp:Label ID=”PriceLabel” runat=”server”

Text='<%# Eval(“Price”, “{0:C}”) %>’>

</asp:Label><br />

<br />

<br />

</ItemTemplate>

</asp:DataList><br />

<asp:HyperLink ID=”CartLink” runat=”server”

NavigateUrl=”~/UserCart.aspx”>

View Shopping Cart

</asp:HyperLink><br />

</form>
Now add a new webform and name it ProductDetails.aspx , this page is used for showing details for selected product from product catalog page, again add a SqlDataSource and DataList Control on this page and configure them according to source shown below, this time datalist is populated using QueryString Parameters.

<asp:SqlDataSource ID=”SqlDataSource1″ runat=”server”

ConnectionString=”<%$ ConnectionStrings:ConnectionString %>”

SelectCommand=”SELECT [ProductID], [Name], [Description],

[Price], [ImageUrl] FROM [Products]

WHERE ([ProductID] = @ProductID)”>

<SelectParameters>

<asp:QueryStringParameter Name=”ProductID”

QueryStringField=”ProductID”

Type=”Decimal” />

</SelectParameters>

</asp:SqlDataSource>

</div>

 

<asp:DataList ID=”DataList1″ runat=”server”

DataSourceID=”SqlDataSource1″>

<ItemTemplate>

<asp:Image ID=”Image1″ runat=”server”

ImageUrl='<%# Eval(“ImageUrl”,”~/Images\\{0}”) %>’/>

<asp:Label ID=”ImageUrlLabel” runat=”server”

Text='<%# Eval(“ImageUrl”) %>’

Visible=”False”>

</asp:Label><br />

<asp:Label ID=”NameLabel” runat=”server”

Text='<%# Eval(“Name”) %>’>

</asp:Label><br />

<asp:Label ID=”DescriptionLabel” runat=”server”

Text='<%# Eval(“Description”) %>’>

</asp:Label><br />

<asp:Label ID=”PriceLabel” runat=”server”

Text='<%# Eval(“Price”, “{0:##0.00}” ) %>’>

</asp:Label><br />

</ItemTemplate>

</asp:DataList><br />

<asp:Button ID=”btnAdd” runat=”server” OnClick=”Button1_Click”

Text=”Add to Cart” /><br /><br />

<asp:HyperLink ID=”HyperLink1″ runat=”server”

NavigateUrl=”~/Products.aspx”>

Return to Products Page

</asp:HyperLink>

Write this code in C# code behind of ProductDetails.aspx page

protected void Button1_Click(object sender, EventArgs e)

{

double Price = double.Parse(((Label)

DataList1.Controls[0].FindControl(“PriceLabel”)).Text);

string ProductName = ((Label)

DataList1.Controls[0].FindControl(“NameLabel”)).Text;

string ProductImageUrl = ((Label)

DataList1.Controls[0].FindControl(“ImageUrlLabel”)).Text;

int ProductID = int.Parse(Request.QueryString[“ProductID”]);

if (Profile.SCart == null)

{

Profile.SCart = new ShoppingCartExample.Cart();

}

Profile.SCart.Insert

(ProductID, Price, 1, ProductName, ProductImageUrl);

Server.Transfer(“Products.aspx”);

}
Now right click on solution explorer and add new web user control, name it CartControl.ascx
In design view of this control add a new GridView control and a label below gridview, html shource of this control should look like this

<%@ Control Language=”C#” AutoEventWireup=”true”

CodeFile=”CartControl.ascx.cs”

Inherits=”CartControl” %>

<asp:GridView ID=”grdCart” runat=”server”

AutoGenerateColumns=”False”

DataKeyNames=”ProductID”

OnRowCancelingEdit=”grdCart_RowCancelingEdit”

OnRowDeleting=”grdCart_RowDeleting”

OnRowEditing=”grdCart_RowEditing”

OnRowUpdating=”grdCart_RowUpdating”>

<Columns>

<asp:TemplateField>

<ItemTemplate>

<asp:Image ID=”Image1″ runat=”server”

ImageUrl='<%#Eval(“ImageUrl”,”~/Images/thumb_{0}”)%>’/>

</ItemTemplate>

</asp:TemplateField>

<asp:BoundField DataField=”ProductName”

HeaderText=”Product” ReadOnly=”True”/>

<asp:BoundField DataField=”Quantity” HeaderText=”Quantity”/>

<asp:BoundField DataField=”Price” DataFormatString=”{0:c}”

HeaderText=”Price” ReadOnly=”True” />

<asp:BoundField DataField=”SubTotal” DataFormatString=”{0:c}”

HeaderText=”Total” ReadOnly=”True” />

<asp:CommandField ShowDeleteButton=”True”

ShowEditButton=”True”/>

</Columns>

<EmptyDataTemplate>

Your Shopping Cart is empty, add items

<a href=”Products.aspx”>Add Products</a>

</EmptyDataTemplate>

</asp:GridView>

<asp:Label ID=”TotalLabel” runat=”server”></asp:Label>
Open web.config file and add this section for enabling anonymous users to add items to cart

<system.web>

<authorization>

<allow users=”?” />

<allow roles=”admin” />

</authorization>

<roleManager enabled=”true” />

<authentication mode=”Forms” />

<compilation debug=”true”>

</compilation>

</system.web>

<system.web>

<anonymousIdentification enabled=”true”/>

<profile enabled=”true”>

<properties>

<add name=”SCart” serializeAs=”Binary”

type=”ShoppingCartExample.Cart”

allowAnonymous=”true”/>

</properties>

</profile>

</system.web>
Now go to code behnd of CartControl.ascx and write this code

protected void Page_Load(object sender, EventArgs e)

{

if (Profile.SCart == null)

{

Profile.SCart = new ShoppingCartExample.Cart();

}

if (!Page.IsPostBack)

{

ReBindGrid();

}

if(Profile.SCart.Items == null)

{

TotalLabel.Visible = false;

}

}

protected void grdCart_RowEditing

(object sender, GridViewEditEventArgs e)

{

grdCart.EditIndex = e.NewEditIndex;

ReBindGrid();

}

protected void grdCart_RowUpdating

(object sender, GridViewUpdateEventArgs e)

{

TextBox txtQuantity = (TextBox)

grdCart.Rows[e.RowIndex].Cells[2].Controls[0];

int Quantity = Convert.ToInt32(txtQuantity.Text);

if (Quantity == 0)

{

Profile.SCart.Items.RemoveAt(e.RowIndex);

}

else

{

Profile.SCart.Items[e.RowIndex].Quantity

= Quantity;

}

grdCart.EditIndex = -1;

ReBindGrid();

}

protected void grdCart_RowCancelingEdit

(object sender, GridViewCancelEditEventArgs e)

{

grdCart.EditIndex = -1;

ReBindGrid();

}

protected void grdCart_RowDeleting

(object sender, GridViewDeleteEventArgs e)

{

Profile.SCart.Items.RemoveAt(e.RowIndex);

ReBindGrid();

}

private void ReBindGrid()

{

grdCart.DataSource = Profile.SCart.Items;

DataBind();

TotalLabel.Text = string.Format(“Total:{0,19:C}”,

Profile.SCart.Total);

}
Now add Global Application Class (Global.asax) by right clicking on solution explorer > add new Item. and write code mentioned below in it.

01void Profile_OnMigrateAnonymous(object sender, ProfileMigrateEventArgs e)

02    {

03        ProfileCommon anonymousProfile = Profile.GetProfile(e.AnonymousID);

04        if (anonymousProfile.SCart != null)

05        {

06            if (Profile.SCart == null)

07                Profile.SCart = new ShoppingCartExample.Cart();

08

09            Profile.SCart.Items.AddRange(anonymousProfile.SCart.Items);

10

11            anonymousProfile.SCart = null;

12        }

13

14        ProfileManager.DeleteProfile(e.AnonymousID);

15        AnonymousIdentificationModule.ClearAnonymousIdentifier();

16    }

17

Add another webform and name it UserCart.aspx, in design view of this page drag the CartControl we’ve just created and put a hyperlink for going back to products cataloge page

Tha’s it , build and run the application
Have fun

 

Build a Shopping Cart by use C# work in asp.net—continue

Recently studying Java in UTS , It remind me that really like c# I just learned in TAFE.

Previous I create a shopping cart table in my database then use c# to add,update,delete the products in my shopping cart table into my database.

But know I have better solution,just by create a Shopping Cart Class,

here is it the Shopping Cart Class:(ShoppingCart.cs)

 

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Collections.Generic;

namespace ShoppingCartExample
{
    [Serializable] 
    public class CartItem
    {
        private int _productID;
        private string _productName;
        private string _imageUrl;
        private int _quantity;
        private double _price;
        private double _subTotal;

        public CartItem()
        { 
        }
        public CartItem(int ProductID, string ProductName, string ImageUrl, int Quantity, double Price)
        {
            _productID = ProductID;
            _productName = ProductName;
            _imageUrl = ImageUrl;
            _quantity = Quantity;
            _price = Price;
            _subTotal = Quantity * Price;

        }
        public int ProductID
        {
            get
            {
                return _productID;
            }
            set
            {
                _productID = value;
            }
        }

         public string ProductName
         {
            get { return _productName; }
            set { _productName = value; }
         }

         public string ImageUrl
         {
             get { return _imageUrl; }
             set { _imageUrl = value; }
         }

         public int Quantity
         {
             get { return _quantity; }
             set { _quantity = value; }
         }

         public double Price
         {
             get { return _price; }
             set { _price = value; }
         }

         public double SubTotal
         {
             get { return _quantity * _price; }
            
         }
     
    }
    [Serializable]
    public class Cart
    {
        private DateTime _dateCreated;
        private DateTime _lastUpdate;
        private List _items;

        public Cart()
        {
            if (this._items == null)
            {
                this._items = new List();
                this._dateCreated = DateTime.Now;
            }
        }

        public List Items
        {
 		get { return _items;}
		set { _items = value;}
	    }

        public void Insert(int ProductID, double Price, int Quantity, string ProductName, string ImageUrl)
        {
            int ItemIndex = ItemIndexOfID(ProductID);
            if (ItemIndex == -1)
            {
                CartItem NewItem = new CartItem();
                NewItem.ProductID = ProductID;
                NewItem.Quantity = Quantity;
                NewItem.Price = Price;
                NewItem.ProductName = ProductName;
                NewItem.ImageUrl = ImageUrl;
                _items.Add(NewItem);
            }
            else
            {
                _items[ItemIndex].Quantity += 1;
            }
            _lastUpdate = DateTime.Now;
        }

        public void Update(int RowID, int ProductID, int Quantity, double Price)
        {
            CartItem Item = _items[RowID];
            Item.ProductID = ProductID;
            Item.Quantity = Quantity;
            Item.Price = Price;
            _lastUpdate = DateTime.Now;
        }

        public void DeleteItem(int rowID)
        {
            _items.RemoveAt(rowID);
            _lastUpdate = DateTime.Now;
        }

        private int ItemIndexOfID(int ProductID)
        {
            int index = 0;
            foreach (CartItem item in _items)
            {
                if (item.ProductID == ProductID)
                {
                    return index;
                }
                index += 1;
            }
            return -1;
        }

        public double Total
        {
            get
            {
                double t = 0;
                if (_items == null)
                {
                    return 0;
                }
                foreach (CartItem Item in _items)
                {
                    t += Item.SubTotal;
                }
                return t;
            }
        }
 
    }
}