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// Serialize into StringBuilder StringBuilder sb = new StringBuilder(); StringWriter sw = new StringWriter(sb); serializer.Serialize(sw, this); sw.Flush(); // Replace UTF-16 encoding with UTF-8 encoding string xml = sb.ToString(); xml = xml.Replace("utf-16", "utf-8"); return xml; } } } } 12. Now you ve finished adding the classes, so add a new Web Form to the root of BalloonShop called DataCashLibTest.aspx, for testing (use the standard BalloonShop Master Page for now). 13. Add a single multiline TextBox control to the page called OutputBox and make it big enough to see plenty of text, such as in the highlighted code: <%@ Page Title="" Language="C#" MasterPageFile="~/BalloonShop.master" AutoEventWireup="true" CodeFile="DataCashLibTest.aspx.cs" Inherits= "DataCashLibTest" %> <asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> <asp:TextBox ID="OutputBox" runat="server" Height="400px" TextMode="MultiLine" Width="700px"></asp:TextBox> </asp:Content> 14. Add using references to DataCashLib and System.Text to the top of DataCashLibTest. aspx.cs. 15. Modify the code in DataCashLibTest.aspx.cs as follows, replacing the values for dataCashClient and dataCashPassword with your own values (obtained when you signed up with DataCash). You ll also have to change the Merchant Reference number to be a different value, or else you ll get a duplicate reference response returned to you: using using using using using System; DataCashLib; System.Text; System.IO; System.Xml.Serialization;

Running the test code results in the following: value value=0 reference value=10 When you assign and modify an embedded reference type, the reference type instance is modified for both variables. In this case, when we assigned the value type, the contents were copied, including the pointer to the reference type. Table 4-1 summarizes the behavior of types when the allocated variable is assigned to another variable and the data member from the original is modified. For example, if the code is custom2 = custom1; custom1.member = [new value], what s the value of custom2.member Table 4-1. Behavior When the Allocated Variable Is Assigned to Another Variable and the Data Member from the Original Is Modified

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public partial class DataCashLibTest : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { // Prepare StringBuilder for output StringBuilder sb = new StringBuilder(); // Initialize variables DataCashRequest request; XmlSerializer requestSerializer = new XmlSerializer(typeof(DataCashRequest)); DataCashResponse response; XmlSerializer responseSerializer = new XmlSerializer(typeof(DataCashResponse)); StringBuilder xmlBuilder; StringWriter xmlWriter; string dataCashUrl = "https://testserver.datacash.com/Transaction"; string dataCashClient = "99341800"; string dataCashPassword = "bbdNsX7p"; // Construct pre request request = new DataCashRequest(); request.Authentication.Client = dataCashClient; request.Authentication.Password = dataCashPassword; request.Transaction.TxnDetails.MerchantReference = "9999999"; request.Transaction.TxnDetails.Amount.Amount = "49.99"; request.Transaction.TxnDetails.Amount.Currency = "GBP"; request.Transaction.CardTxn.Method = "pre"; request.Transaction.CardTxn.Card.CardNumber = "4444333322221111"; request.Transaction.CardTxn.Card.ExpiryDate = "10/11"; // Display pre request sb.AppendLine("Pre Request:"); xmlBuilder = new StringBuilder(); xmlWriter = new StringWriter(xmlBuilder); requestSerializer.Serialize(xmlWriter, request); sb.AppendLine(xmlBuilder.ToString()); sb.AppendLine(); // Get pre response response = request.GetResponse(dataCashUrl);

Value type Reference type Value type embedding value type Value type embedding reference type Reference type embedding value type Reference type embedding reference type

// Display pre response sb.AppendLine("Pre Response:"); xmlBuilder = new StringBuilder(); xmlWriter = new StringWriter(xmlBuilder); responseSerializer.Serialize(xmlWriter, response); sb.AppendLine(xmlBuilder.ToString()); sb.AppendLine(); // Construct fulfil request request = new DataCashRequest(); request.Authentication.Client = dataCashClient; request.Authentication.Password = dataCashPassword; request.Transaction.HistoricTxn.Method = "fulfill"; request.Transaction.HistoricTxn.AuthCode = response.MerchantReference; request.Transaction.HistoricTxn.Reference = response.DatacashReference; // Display fulfil request sb.AppendLine("Fulfil Request:"); xmlBuilder = new StringBuilder(); xmlWriter = new StringWriter(xmlBuilder); requestSerializer.Serialize(xmlWriter, request); sb.AppendLine(xmlBuilder.ToString()); sb.AppendLine(); // Get fulfil response response = request.GetResponse(dataCashUrl); // Display fulfil response sb.AppendLine("Fulfil Response:"); xmlBuilder = new StringBuilder(); xmlWriter = new StringWriter(xmlBuilder); responseSerializer.Serialize(xmlWriter, response); sb.AppendLine(xmlBuilder.ToString()); // Output result OutputBox.Text = sb.ToString(); } } 16. Now build and run the solution. You should get a response similar to that shown in Figure 20-1.

If you provide a smaller value for the Convergence setting, Solver could try for a better solution; Tip

Assigned data member is not modified Assigned data member is modified Assigned embedded data member is not modified Assigned embedded data member is modified Assigned embedded data member is modified Assigned embedded data member is modified

Figure 20-1. Testing the DataCash library The complete text displayed in the OutputBox text box is as follows: Pre Request: < xml version="1.0" encoding="utf-16" > <Request xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <Authentication> <password>bbdNsX7p</password> <client>99341800</client> </Authentication> <Transaction> <TxnDetails> <merchantreference>9999999</merchantreference> <amount currency="GBP">49.99</amount> </TxnDetails> <CardTxn> <method>pre</method> <Card> <pan>4444333322221111</pan> <expirydate>10/11</expirydate> </Card> </CardTxn> </Transaction> </Request>

Another value type constraint relates to how variables are stored and manipulated when they are passed via a method. Suppose you create a method that has as parameters a value type and a reference type. If in the method the parameters are modified, what modifications does the caller of the method see Consider the following code: static void Method(MyValueType value, MyReferenceType reference) { value.value = 10; reference.value = 10; } The caller can pass in instances of a value type and a reference type that are manipulated in the context of the method. Now let s call Method() with the following code: MyValueType value = new MyValueType(); MyReferenceType reference = new MyReferenceType(); Method(value, reference); Console.WriteLine("value value=" + value.value + " reference value=" + reference.value); The calling code instantiates the types MyValueType and MyReferenceType, calls the method Method(), and then inspects the value of the data member value from the value and reference types.

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