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LottoLibrary.Ticket ticket = (LottoLibrary.Ticket)formatter.Deserialize(input); builder.AppendFormat( "{0}.{1}.{2} {3} {4} {5} {6} {7} {8} {9}\n", ticket.DrawDate.Year, ticket.DrawDate.Month, ticket.DrawDate.Day, ticket.Numbers[0], ticket.Numbers[1], ticket.Numbers[2], ticket.Numbers[3], ticket.Numbers[4], ticket.Numbers[5], ticket.Bonus); } } catch (Exception e) { } output.Write(builder.ToString()); } } } In the code, a binary stream is read using the BinaryFormatter class, which reads a type from the data stream. Notice how the method Deserialize() does not ask for which type to read. This is because all of that information is saved in the stream. Deserialize() will read an object, associate the object with a type, instantiate it, and populate the data members. The bolded code in the preceding listing points out where deserialization becomes tricky, which centers around when to read what type. A binary stream when processed by the BinaryFormatter will read and write objects. BinaryFormatter will instantiate whatever it encounters and assumes that the caller of BinaryFormatter knows which type is being manipulated. If the caller does not know this, an exception will occur because the type cast to the specific type will fail. The exception block is necessary because you don t know how many Ticket objects have been saved, as the count has not been saved to the stream. .NET provides the Position and Length properties to determine if any instances are left to be read, but those properties work only with files. If the binary stream being read is a console data stream, there is no length or position. Thus, the only real solution is to keep reading until you can t do so anymore and assume processing is complete.

The last thing you need to do before launching the e-commerce site is enable credit card processing. In this chapter, we ll look at how you can build this into the pipeline you created in s 18 and 19 by using the DataCash service. By the end of this chapter, BalloonShop will be a fully functioning, secure, and usable e-commerce application.

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The fact that Position and Length have different behaviors depending on the implementation might seem to break the contract of being able to separate intention from implementation. It seems to break the component software paradigm because, as a developer, you do need to know about the stream implementation. The rule has not been broken, but been put on hold, because sometimes you are left with no other option. A file stream and console stream share many characteristics, but knowing the length is not one of them. A programmer could force the console stream to give back some value, but that would be incorrect. The smarter approach, and the one chosen by the .NET implementers, is to generate an exception. The binary stream formatter can become even pickier. Look at Figure 10-8 again and notice how the type information with version identifiers is stored in the stream. Imagine the situation where you create an assembly that saves some objects. Then x years and n versions of the program later, you try to load the file. You can t, because the version of the type does not exist. It is smart for the binary formatter to not instantiate a version of a type that does not exist, because otherwise there could be serialization failures.

With this setting, any logged-in users (not only administrators) would be allowed access to the admin page.

When dealing with serialization, you may come across a particular text or binary format that will require some extra work. Also, you may have some objects that you want to exclude from serialization.

Tip By default, all visitors are allowed access to all pages, so you need to explicitly deny access to the

his appendix provides a brief introduction to the Excel what-if data analysis tools: Goal Seek, data tables, scenarios, and Solver. Each introduction is accompanied by a simple example.

Sometimes I think there are as many file formats as there are grains of sand on a beach. As just two examples, specializations of text formats are XML and JSON (for JavaScript Object Notation, used in JavaScript for your web browser). In most cases, the default serializations will work. However, you may need to tweak a particular serialization. Many serialization techniques allow custom serializations of a particular object. The default serialization implies a certain marshaling. For example, it might mean an integer will be marshaled as an integer in another representation. Sometimes, however, you might want different representations in different streams. In that case, you need to implement the marshaling of the data member yourself. With most serialization platforms, it means implementing a particular interface. Following is an example that performs a custom serialization for a .NET binary stream. [Serializable] class MyObject : ISerializable { int value; public MyObject() { } public MyObject(SerializationInfo info, StreamingContext context) { size = int.Parse(info.GetValue("value", typeof(string))); } public void GetObjectData(SerializationInfo info, StreamingContext context) { info.AddValue("value", value.ToString()); } }

The department administration section will allow your client to add, remove, or change department information. To implement this functionality, you ll need to write the code for the presentation, business, and data layers. The page you re about to create is shown in Figure 11-13. Figure 11-13 shows how the AdminDepartments Web Form will look.

Figure 11-13. The department administration page The form is formed from a list populated with the departments information, and it also has four additional controls (a label, two text boxes, and a button) used to add new departments to the list. The list control you see in Figure 11-13 is not a DataList, but a GridView control.

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