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difference here is that GET requests have just a URL and header information; POST requests have all this plus a message body. Think of an HTTP POST request as if it were an email, with the HTTP response being the email reply. In both cases, header information is like the address and subject of the email, and body information is like the message body of an email.

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Now that you have a basic understanding of what serialization is, let s delve straight into XML serialization. You will be building an application that illustrates the serialization and deserialization process by using the XmlSerializer class. The application user interface is shown in Figure 8-1. qr code reader

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Next, you need to supply the body of the POST request, which is the XML document you want to send. To do this, you get the serialized version of the data contained in the object via the Xml property (which simply serializes the DataCashRequest instance into XML, by using the XML serialization attributes): byte[] bodyBytes = encoding.GetBytes(Xml); You also need to specify the length of the data contained in the HTTP header for the request: httpRequest.ContentLength = bodyBytes.Length; Next, you take the XML data and place it into the request via standard stream manipulation code: Stream httpRequestBodyStream = httpRequest.GetRequestStream(); httpRequestBodyStream.Write(bodyBytes, 0, bodyBytes.Length); httpRequestBodyStream.Close(); After you have the request class, you can obtain the response, also via stream manipulation: HttpWebResponse httpResponse = httpRequest.GetResponse() as HttpWebResponse; StreamReader httpResponseStream = new StreamReader(httpResponse.GetResponseStream(), System.Text.Encoding.ASCII); string httpResponseBody = httpResponseStream.ReadToEnd(); httpResponseStream.Close(); You only need the XML data contained in this stream, so clip off the headers at the beginning of the data returned before deserializing it. You do this using the String.Substring method to obtain the section of the string that starts with "< xml", the location of which is found using the String.IndexOf method. httpResponseBody = httpResponseBody.Substring( httpResponseBody.IndexOf("< xml")); XmlSerializer serializer = new XmlSerializer(typeof(DataCashResponse)); StringReader responseReader = new StringReader(httpResponseBody); Finally, you cast the deserialized object into a DataCashResponse object for further manipulation:

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return serializer.Deserialize(responseReader) as DataCashResponse; } After the transaction has completed, you can check that everything has worked properly via the DataCash reporting web interface.

Figure 8-1. Application for illustrating XML serialization The application consists of a class called Employee with five public properties: EmployeeID, FirstName, LastName, HomePhone, and Notes. There are five text boxes that accept values for these properties. The two buttons, Serialize and Deserialize, do the job of serializing and deserializing the Employee object, respectively. The check box determines whether the serialized XML document will be opened in a browser for viewing. Before you can use the XmlSerializer class, you should create the Employee class as shown in Listing 8-1. Listing 8-1. The Employee Class public class Employee { private int intID; private string strFName; private string strLName; private string strHPhone; private string strNotes;

Now you have a new set of classes that you can use to perform credit card transactions. However, you need to modify a few things to integrate it with your existing e-commerce application and pipeline.

Many people purchase a domain name before owning or operating a blog or web site to reserve the name they want while it is available. The following exercise assumes that you have previously purchased a domain from another registrar (like GoDaddy or Network Solutions) and that you would like to use it with your Blogger blog.

public int EmployeeID { get { return intID; } set { intID = value; } } public string FirstName { get { return strFName; } set { strFName = value; } } public string LastName { get { return strLName; } set { strLName = value; } } public string HomePhone { get { return strHPhone; } set

In fact, all the modifications you ll make to BalloonShop occur at the business tier because we ve slipped in the data and presentation tier modifications already. We also have AuthCode and Reference fields ready to use for the database. In the presentation tier, we have the user interface elements in place to check on these values. All you have to do is make the PSCheckFunds and PSTakePayment pipeline sections work.

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