3.
Replace the comment with an ImageButton control so that the mark up is replaced as 
follows: 
<
:
asp ImageButton
="CheckoutImageBtn" 
="server"  
ID
runat
="https://www.paypal.com/en_US/i/btn/btn_xpressCheckout.gif"  
ImageUrl
="145" 
="Check out with PayPal"  
Width
AlternateText
="CheckoutBtn_Click"  
OnClick
="Transparent" 
="0" /> 
BackColor
BorderWidth
4.
In the ShoppingCart.aspx.cs file, after the UpdateBtn_Click event handler near the end 
of the file, add the CheckOutBtn_Click event handler: 
CheckoutBtn_Click(
sender, 
protected void
object
e) 
ImageClickEventArgs
(
using
usersShoppingCart = 
ShoppingCartActions
new
()) 
ShoppingCartActions
Session[
] = usersShoppingCart.GetTotal(); 
"payment_amt"
Response.Redirect(
); 
"Checkout/CheckoutStart.aspx"
5.
Also in the ShoppingCart.aspx.cs file, add a reference to the CheckoutBtn, so that the 
new image button is referenced as follows: 
Page_Load(
sender, 
protected void
object
e) 
EventArgs
(
using
usersShoppingCart = 
ShoppingCartActions
new
()) 
ShoppingCartActions
cartTotal = 0; 
decimal
cartTotal = usersShoppingCart.GetTotal(); 
(cartTotal > 0) 
if
// Display Total.
lblTotal.Text = 
.Format(
String
, cartTotal); 
"{0:c}"
else
LabelTotalText.Text = 
""
lblTotal.Text = 
""
ShoppingCartTitle.InnerText = 
"Shopping Cart is Empty"
UpdateBtn.Visible = 
false
CheckoutImageBtn.Visible = 
false
6.
Save your changes to both the ShoppingCart.aspx file and the ShoppingCart.aspx.cs file. 
7.
From the menu, select Debug -> Build WingtipToys. 
The project will be rebuilt with the newly added ImageButton control. 
Send Purchase Details to PayPal 
When the user clicks the Checkout button on the shopping cart page (ShoppingCart.aspx), 
they’ll begin the purchase process. The following code calls the first PayPal function needed to 
purchase products.  
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1.
From the Checkout folder, open the code-behind file named CheckoutStart.aspx.cs.  
Be sure to open the code-behind file. 
2.
Replace the existing code with the following:  
System; 
using
System.Collections.Generic; 
using
System.Linq; 
using
System.Web; 
using
System.Web.UI; 
using
System.Web.UI.WebControls; 
using
WingtipToys.Checkout 
namespace
public partial class
: System.Web.UI.
CheckoutStart
Page
Page_Load(
sender, 
protected void
object
e) 
EventArgs
payPalCaller = 
NVPAPICaller
new
(); 
NVPAPICaller
retMsg = 
string
""
token = 
string
""
(Session[
if
] != 
"payment_amt"
null
amt = Session[
string
].ToString(); 
"payment_amt"
ret = payPalCaller.ShortcutExpressCheckout(amt, 
token, 
bool
ref
ref
retMsg); 
(ret) 
if
Session[
] = token; 
"token"
Response.Redirect(retMsg); 
else
Response.Redirect(
+ retMsg); 
"CheckoutError.aspx?"
else
Response.Redirect(
); 
"CheckoutError.aspx?ErrorCode=AmtMissing"
When the user of the application clicks the Checkout button on the shopping cart page, the 
browser will navigate to the CheckoutStart.aspx page. When the CheckoutStart.aspx page loads, 
the ShortcutExpressCheckout method is called. At this point, the user is transferred to the 
PayPal testing web site. On the PayPal site, the user enters their PayPal credentials, reviews the 
purchase details, accepts the PayPal agreement and returns to the Wingtip Toys sample 
application where the ShortcutExpressCheckout method completes. When the 
ShortcutExpressCheckout method is complete, it will redirect the user to the 
CheckoutReview.aspx page specified in the ShortcutExpressCheckout method. This allows 
the user to review the order details from within the Wingtip Toys sample application. 
Review Order Details 
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After returning from PayPal, the CheckoutReview.aspx page of the Wingtip Toys sample 
application displays the order details. This page allows the user to review the order details 
before purchasing the products. The CheckoutReview.aspx page must be created as follows: 
1.
In the Checkout folder, open the page named CheckoutReview.aspx. 
2.
Replace the existing markup with the following:  
<%@ 
Page
="" 
="C#" 
="~/Site.Master" 
Title
Language
MasterPageFile
="true" 
="CheckoutReview.aspx.cs" 
AutoEventWireup
CodeBehind
="WingtipToys.Checkout.CheckoutReview" %> 
Inherits
<
:
asp Content
="Content1" 
="MainContent" 
="server"> 
ID
ContentPlaceHolderID
runat
< >Order Review</
h1
h1
< ></ > 
p
p
<h3 
="
: 33px">Products:</
style
padding-left
h3
<
:
asp GridView
="OrderItemList" 
="server" 
="False" 
ID
runat
AutoGenerateColumns
="Both" 
="10" 
="500" 
="#efeeef" 
GridLines
CellPadding
Width
BorderColor
="33">               
BorderWidth
<
Columns
<
:
asp BoundField
="ProductId" 
=" Product ID" />         
DataField
HeaderText
<
:
asp BoundField
="Product.ProductName" 
=" 
DataField
HeaderText
Product Name" />         
<
:
asp BoundField
="Product.UnitPrice" 
="Price 
DataField
HeaderText
(each)" 
="{0:c}"/>      
DataFormatString
<
:
asp BoundField
="Quantity" 
="Quantity" />         
DataField
HeaderText
</
>     
Columns
</
:
asp GridView
<
:
asp DetailsView
="ShipInfo" 
="server" 
="false" 
ID
runat
AutoGenerateRows
="None" 
="10" 
="None" 
GridLines
CellPadding
BorderStyle
CommandRowStyle-
="None"> 
BorderStyle
<
Fields
<
:
asp TemplateField
<
ItemTemplate
<
>Shipping Address:</ > 
h3
h3
<
/> 
br
<
:
asp Label
="FirstName" 
="server" 
='<%#: 
ID
runat
Text
Eval(
) %>'></
"FirstName"
:
>   
asp Label
<
:
asp Label
="LastName" 
="server" 
='<%#: 
ID
runat
Text
Eval(
) %>'></
"LastName"
:
asp Label
<
/> 
br
<
:
asp Label
="Address" 
="server" 
='<%#: 
ID
runat
Text
Eval(
) %>'></
"Address"
:
asp Label
<
/> 
br
<
:
asp Label
="City" 
="server" 
='<%#: Eval(
ID
runat
Text
"City"
%>'></
:
asp Label
<
:
asp Label
="State" 
="server" 
='<%#: Eval(
ID
runat
Text
"State"
%>'></
:
asp Label
<
:
asp Label
="PostalCode" 
="server" 
='<%#: 
ID
runat
Text
Eval(
) %>'></
"PostalCode"
:
asp Label
< ></ > 
p
p
<
>Order Total:</ > 
h3
h3
<
/> 
br
<
:
asp Label
="Total" 
="server" 
='<%#: Eval(
ID
runat
Text
"Total"
) %>'></
"{0:C}"
:
asp Label
</
ItemTemplate
<
ItemStyle
="Left" /> 
HorizontalAlign
</
:
asp TemplateField
</
Fields
</
:
asp DetailsView
< ></ > 
p
p
 /> 
hr
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<
:
asp Button
="CheckoutConfirm" 
="server" 
="Complete Order" 
ID
runat
Text
="CheckoutConfirm_Click" /> 
OnClick
</
:
asp Content
3.
Open the code-behind page named CheckoutReview.aspx.cs and replace the existing 
code with the following:  
System; 
using
System.Collections.Generic; 
using
System.Linq; 
using
System.Web; 
using
System.Web.UI; 
using
System.Web.UI.WebControls; 
using
WingtipToys.Models; 
using
WingtipToys.Checkout 
namespace
public partial class
: System.Web.UI.
CheckoutReview
Page
Page_Load(
sender, 
protected void
object
e) 
EventArgs
(!IsPostBack) 
if
payPalCaller = 
NVPAPICaller
new
(); 
NVPAPICaller
retMsg = 
string
""
token = 
string
""
PayerID = 
string
""
decoder = 
NVPCodec
new
(); 
NVPCodec
token = Session[
].ToString(); 
"token"
ret = payPalCaller.GetCheckoutDetails(token, 
PayerID, 
bool
ref
ref
decoder, 
retMsg); 
ref
(ret) 
if
Session[
] = PayerID; 
"payerId"
myOrder = 
var
new
(); 
Order
myOrder.OrderDate = 
.ToDateTime(decoder[
Convert
].ToString()); 
"TIMESTAMP"
myOrder.Username = User.Identity.Name; 
myOrder.FirstName = decoder[
].ToString(); 
"FIRSTNAME"
myOrder.LastName = decoder[
].ToString(); 
"LASTNAME"
myOrder.Address = decoder[
].ToString(); 
"SHIPTOSTREET"
myOrder.City = decoder[
].ToString(); 
"SHIPTOCITY"
myOrder.State = decoder[
].ToString(); 
"SHIPTOSTATE"
myOrder.PostalCode = decoder[
].ToString(); 
"SHIPTOZIP"
myOrder.Country = decoder[
].ToString(); 
"SHIPTOCOUNTRYCODE"
myOrder.Email = decoder[
].ToString(); 
"EMAIL"
myOrder.Total = 
.ToDecimal(decoder[
Convert
].ToString()); 
"AMT"
// Verify total payment amount as set on CheckoutStart.aspx.
try
paymentAmountOnCheckout = 
decimal
.ToDecimal(Session[
Convert
].ToString()); 
"payment_amt"
paymentAmoutFromPayPal = 
decimal
.ToDecimal(decoder[
Convert
].ToString()); 
"AMT"
(paymentAmountOnCheckout != paymentAmoutFromPayPal) 
if
Response.Redirect(
"CheckoutError.aspx?"
); 
"Desc=Amount%20total%20mismatch."
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(
catch
Exception
Response.Redirect(
"CheckoutError.aspx?"
); 
"Desc=Amount%20total%20mismatch."
// Get DB context.
_db = 
ProductContext
new
(); 
ProductContext
// Add order to DB.
_db.Orders.Add(myOrder); 
_db.SaveChanges(); 
// Get the shopping cart items and process them.
(WingtipToys.Logic.
using
usersShoppingCart = 
ShoppingCartActions
new
WingtipToys.Logic.
()) 
ShoppingCartActions
<
> myOrderList = usersShoppingCart.GetCartItems(); 
List CartItem
// Add OrderDetail information to the DB for each product 
purchased.
(
i = 0; i < myOrderList.Count; i++) 
for int
// Create a new OrderDetail object.
myOrderDetail = 
var
new
(); 
OrderDetail
myOrderDetail.OrderId = myOrder.OrderId; 
myOrderDetail.Username = User.Identity.Name; 
myOrderDetail.ProductId = myOrderList[i].ProductId; 
myOrderDetail.Quantity = myOrderList[i].Quantity; 
myOrderDetail.UnitPrice = myOrderList[i].Product.UnitPrice; 
// Add OrderDetail to DB.
_db.OrderDetails.Add(myOrderDetail); 
_db.SaveChanges(); 
// Set OrderId.
Session[
] = myOrder.OrderId; 
"currentOrderId"
// Display Order information.
<
> orderList = 
List Order
new
<
>(); 
List Order
orderList.Add(myOrder); 
ShipInfo.DataSource = orderList; 
ShipInfo.DataBind(); 
// Display OrderDetails.
OrderItemList.DataSource = myOrderList; 
OrderItemList.DataBind(); 
else
Response.Redirect(
+ retMsg); 
"CheckoutError.aspx?"
CheckoutConfirm_Click(
sender, 
protected void
object
e) 
EventArgs
Session[
] = 
"userCheckoutCompleted"
"true"
Response.Redirect(
); 
"~/Checkout/CheckoutComplete.aspx"
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The DetailsView control is used to display the order details that have been returned from 
PayPal. Also, the above code saves the order details to the Wingtip Toys database as an 
OrderDetail object. When the user clicks on the Complete Order button, they are redirected 
to the CheckoutComplete.aspx page. 
Tip 
Notice that the <ItemStyle> tag is used to change the style of the items within the 
DetailsView control. By viewing the page in Design View, selecting the DetailsView control, 
and selecting the Smart Tag (the arrow icon at the top right of the control), you will be able to 
see the DetailsView Tasks. 
By selecting Edit Fields, the Fields dialog box will appear. In this dialog box you can easily 
control the visual properties, such as ItemStyle, of the DetailsView control. 
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Complete Purchase 
CheckoutComplete.aspx page makes the purchase from PayPal. As mentioned above, the user 
must click on the Complete Order button before the application will navigate to the 
CheckoutComplete.aspx page. 
1.
In the Checkout folder, open the page named CheckoutComplete.aspx. 
2.
Replace the existing markup with the following:  
<%@ 
Page
="" 
="C#" 
="~/Site.Master" 
Title
Language
MasterPageFile
="true" 
="CheckoutComplete.aspx.cs" 
AutoEventWireup
CodeBehind
="WingtipToys.Checkout.CheckoutComplete" %> 
Inherits
<
:
asp Content
="Content1" 
="MainContent" 
="server"> 
ID
ContentPlaceHolderID
runat
< >Checkout Complete</
h1
h1
< ></ > 
p
p
< >Payment Transaction ID:</
> <
:
h3
h3
asp Label
="TransactionId" 
ID
="server"></
runat
:
asp Label
< ></ > 
p
p
< >Thank You!</ > 
h3
h3
< ></ > 
p
p
 /> 
hr
<
:
asp Button
="Continue" 
="server" 
="Continue Shopping" 
ID
runat
Text
="Continue_Click" /> 
OnClick
</
:
asp Content
3.
Open the code-behind page named CheckoutComplete.aspx.cs and replace the existing 
code with the following:  
System; 
using
System.Collections.Generic; 
using
System.Linq; 
using
System.Web; 
using
System.Web.UI; 
using
System.Web.UI.WebControls; 
using
WingtipToys.Models; 
using
WingtipToys.Checkout 
namespace
public partial class
: System.Web.UI.
CheckoutComplete
Page
Page_Load(
sender, 
protected void
object
e) 
EventArgs
(!IsPostBack) 
if
// Verify user has completed the checkout process.
((
)Session[
if
string
] != 
"userCheckoutCompleted"
"true"
Session[
] = 
"userCheckoutCompleted"
.Empty; 
string
Response.Redirect(
"CheckoutError.aspx?"
); 
"Desc=Unvalidated%20Checkout."
payPalCaller = 
NVPAPICaller
new
(); 
NVPAPICaller
retMsg = 
string
""
token = 
string
""
finalPaymentAmount = 
string
""
PayerID = 
string
""
decoder = 
NVPCodec
new
(); 
NVPCodec
token = Session[
].ToString(); 
"token"
PayerID = Session[
].ToString(); 
"payerId"
finalPaymentAmount = Session[
].ToString(); 
"payment_amt"
ret = payPalCaller.DoCheckoutPayment(finalPaymentAmount, token, 
bool
PayerID, 
decoder, 
retMsg); 
ref
ref
(ret) 
if
// Retrieve PayPal confirmation value.
PaymentConfirmation = 
string
decoder[
].ToString(); 
"PAYMENTINFO_0_TRANSACTIONID"
TransactionId.Text = PaymentConfirmation; 
_db = 
ProductContext
new
(); 
ProductContext
// Get the current order id.
currentOrderId = -1; 
int
(Session[
if
] != 
"currentOrderId"
.Empty) 
string
currentOrderId = 
.ToInt32(Session[
Convert
]); 
"currentOrderID"
myCurrentOrder; 
Order
(currentOrderId >= 0) 
if
// Get the order based on order id.
myCurrentOrder = _db.Orders.Single(o => o.OrderId == 
currentOrderId); 
// Update the order to reflect payment has been completed.
myCurrentOrder.PaymentTransactionId = PaymentConfirmation; 
// Save to DB.
_db.SaveChanges(); 
// Clear shopping cart.
(WingtipToys.Logic.
using
usersShoppingCart = 
ShoppingCartActions
WingtipToys.Logic.
new
()) 
ShoppingCartActions
usersShoppingCart.EmptyCart(); 
// Clear order id.
Session[
] = 
"currentOrderId"
.Empty; 
string
else
Response.Redirect(
+ retMsg); 
"CheckoutError.aspx?"
Continue_Click(
sender, 
protected void
object
e) 
EventArgs
Response.Redirect(
); 
"~/Default.aspx"
When the CheckoutComplete.aspx page is loaded, the DoCheckoutPayment method is called. 
As mentioned earlier, the DoCheckoutPayment method completes the purchase from the 
PayPal testing environment. Once PayPal has completed the purchase of the order, the 
CheckoutComplete.aspx page displays a payment transaction ID to the purchaser.  
Handle Cancel Purchase 
If the user decides to cancel the purchase, they will be directed to the CheckoutCancel.aspx page 
where they will see that their order has been cancelled.  
1.
Open the page named CheckoutCancel.aspx in the Checkout folder. 
2.
Replace the existing markup with the following:  
<%@ 
Page
="" 
="C#" 
="~/Site.Master" 
Title
Language
MasterPageFile
="true" 
="CheckoutCancel.aspx.cs" 
AutoEventWireup
CodeBehind
="WingtipToys.Checkout.CheckoutCancel" %> 
Inherits
<
:
asp Content
="Content1" 
="MainContent" 
="server"> 
ID
ContentPlaceHolderID
runat
< >Checkout Cancelled</
h1
h1
< ></ > 
p
p
< >Your purchase has been cancelled.</
h3
h3
</
:
asp Content
Handle Purchase Errors 
Errors during the purchase process will be handled by the CheckoutError.aspx page. The code-
behind of the CheckoutStart.aspx page, the CheckoutReview.aspx page, and the 
CheckoutComplete.aspx page will each redirect to the CheckoutError.aspx page if an error occurs.  
1.
Open the page named CheckoutError.aspx in the Checkout folder. 
2.
Replace the existing markup with the following:  
<%@ 
Page
="" 
="C#" 
="~/Site.Master" 
Title
Language
MasterPageFile
="true" 
="CheckoutError.aspx.cs" 
AutoEventWireup
CodeBehind
="WingtipToys.Checkout.CheckoutError" %> 
Inherits
<
:
asp Content
="Content1" 
="MainContent" 
="server"> 
ID
ContentPlaceHolderID
runat
< >Checkout Error</ > 
h1
h1
< ></ > 
p
p
<
table
="ErrorTable"> 
id
<
tr
<
td
="field"></
class
td
<
><%=Request.QueryString.Get(
td
)%></
"ErrorCode"
td
</
tr
<
tr
<
td
="field"></
class
td
<
><%=Request.QueryString.Get(
td
)%></
"Desc"
td
</
tr
<
tr
<
td
="field"></
class
td
<
><%=Request.QueryString.Get(
td
)%></
"Desc2"
td
</
tr
</
table
< ></ > 
p
p
</
:
asp Content
The CheckoutError.aspx page is displayed with the error details when an error occurs during the 
checkout process. 
Running the Application 
Run the application to see how to purchase products. 
1.
Open a Web browser and navigate to https://developer.paypal.com . 
2.
Login with your PayPal developer account that you created earlier in this tutorial. 
For PayPal’s developer sandbox, you need to be logged in at 
https://developer.paypal.com to test express checkout. This only applies to PayPal’s 
sandbox testing, not to PayPal’s live environment. 
3.
In Visual Studio, press F5 to run the Wingtip Toys sample application. 
After the database rebuilds, the browser will open and show the Default.aspx page. 
4.
Add three different products to the shopping cart by selecting the product category, 
such as “Cars” and then clicking Add to Cart next to each product. 
The shopping cart will display the product you have selected. 
Documents you may be interested
Documents you may be interested