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) Since WPF rebuilds so much of the UI infrastructure from the ground up, it took awhile to emerge it only appeared in NET version 30, almost half a decade after NET 10 shipped Windows Forms was available from day one, presumably due in part to its less ambitious scope since Windows provided the underpinnings it has less to do than WPF While this history explains how we ended up with two different technologies for building Windows desktop applications in C#, it leaves the question: why might you care about Windows Forms today WPF was invented to get away from some limitations of the underlying Win32 UI system, so it s more powerful than Windows Forms, but Windows Forms offers a couple of advantages First, because Windows Forms was around long before WPF, it s very well supported, both by Microsoft s tools and by third parties.

In Visual Studio, the Windows Forms designer is more mature than the WPF one in Windows Forms, you can get a higher proportion of things done in the designer than in WPF, where you can end up needing to do more things by hand in C# or Xaml And if you re looking to reuse existing controls, you might be able to find Windows Forms controls that offer more of the features you would like than the nearest WPF equivalent (You can mix WPF and Windows Forms in a single application, so you might end up using a Windows Forms.

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control in a WPF application, although using two different UI frameworks can complicate your program) The second advantage of Windows Forms is that it tends to be somewhat more frugal WPF applications often have a larger memory footprint than an equivalent application would in Windows Forms Of course, it s not always possible to build an equivalent application in Windows Forms, but if you re not exploiting any of the potential benefits of WPF, you may be paying for things you don t need If your application needs to run on older machines with low specifications, this may be the deciding factor If neither of these benefits is useful to you, WPF is likely to be a better choice Windows Forms lacks WPF s powerful composition-based model, exemplified by the content model and powerful template system Windows Forms is less strong graphically, and has no animation support.

It doesn t have styling features, has a much more basic data binding system, and has no equivalent of Xaml, which seems to have had the result that very few tools outside of Visual Studio offer any kind of Windows Forms support, whereas tools that can export to Xaml are rather more widespread (And while it s technically possible to create Windows Forms user interfaces in Xaml, Visual Studio doesn t support this, and it s rather cumbersome because Windows Forms was not designed with Xaml in mind) Moreover, Microsoft has indicated that Windows Forms is unlikely to see much significant new development it will be fully supported for years to come, but it will not grow many new features.

Encryption can help us achieve confidentiality, among other security goals. In this section, we start exploring cryptographic primitives for encryption. In particular, we will start with studying block ciphers, in which, say, blocks of 64, 128, or 256 bits are encrypted at one time. Many encryption algorithms have been developed over time, and we examine a few of them here. We start by looking at the Data Encryption Standard (DES) and Triple DES algorithms. We will also cover the Advanced Encryption Standard (AES) algorithm selected by NSA in 2000 to deal with the inevitable obsolescence of DES. In addition to DES, Triple DES, and AES block ciphers, we also discuss RC4, a stream cipher, in Section 12.2.2.

Since you ve continued reading, presumably the benefits are of interest to you, so in this chapter, we ll walk through the creation of a simple Windows Forms application to show you the Visual Studio designer support and the main aspects of the programming model..

Before we examine the .__formatResponseDataRSSItem function further, let s examine Listing 7-10, which is an internal RSS block function that creates an RSSItem object from 14 parameters that make up an RSS post. This function is used by the .__formatResponseDataRSSItem function after it has parsed the XML in the returnResponse variable that was passed to it.

We ll build a simple application for showing and editing a to-do list. To create a new Windows Forms application, open the New Project dialog (Ctrl-Shift-N) and in the Installed Templates on the left, select Visual C# Windows. In the templates in the middle, select Windows Forms Application. We ll call our project ToDoList. Visual Studio will create a new project with a single form called Form1 a class derived from the Form base class. A Form is just a window the name reflects the fact that one of the tasks Windows Forms is particularly well suited to is making line-of-business applications that involve filling in forms. Visual Studio will be showing the empty form in a design view that you can drag controls onto. However, before we start adding the UI, we re going to define a class to represent the to-do items in our application. So we ll add a new class called ToDoEntry to the project, shown in Example 22-1.

public class ToDoEntry { public string Title { get; set; } public string Description { get; set; } public DateTime DueDate { get; set; } }

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