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name also has a capital letter, such as ThisIsAVariable. One alternative scheme is camelCasing, where the first word isn t capitalized for example, thisIsAVariable. The capitalization in the names of these casing schemes serves as a reminder of their usage.

specify the out and ref keywords when declaring the method and when calling the method. Programming in C#, you are always aware of what a parameter, method, variable, or class does and how. This explicitness makes it possible for another person to read your code and understand what you are trying to do.

One of the classes used, TransactionClass, is slightly more complicated than the others, because the <Transaction> element contains one of either <CardTxn> or <HistoricTxn>, depending on whether the request is a pre request or a fulfil request. Instead of using fields, this class uses properties that ensure that only one of these two elements is used. The DataCashRequest class also has a method called GetResponse that sends the request and packages the returned response as a DataCashResponse class. In the code to do this, you start by creating an HttpWebRequest instance for the URL supplied as a parameter: public DataCashResponse GetResponse(string url) { HttpWebRequest httpRequest = WebRequest.Create(url) as HttpWebRequest; This request is then defined as a POST request with the appropriate encoding: httpRequest.Method = "POST"; UTF8Encoding encoding = new UTF8Encoding();

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Now that you have an understanding of the depth-first search algorithm and how the data structure will be defined as a user-defined value type, let s get started building the search algorithm.

You can also click the Save Scenario button to open the Save Scenario dialog box, where you can save cell values for use with the Scenario Manager dialog box. For details on working with the Scenario Manager dialog box, see 3.

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.

The search algorithm we will write in this chapter deals with the problem of planning a flight from point A to point B. The first step is to figure out the features we need to implement. Here s a summary: A data structure implements the node. A node can contain references to other nodes. Each node has a description and unique identifier to distinguish it from other nodes. All of the nodes have flight information. An algorithm will traverse the nodes and keep track of its path. The path is returned as a list of nodes.

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:

The data structure is based on the problem of planning a flight between two places, as illustrated in Figure 4-7.

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.

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.

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