Simple .NET/ASP.NET PDF document editor web control SDK

public partial class MainPage : UserControl { private Button myButton; private TextBlock messageText; public MainPage() { InitializeComponent(); myButton = new Button { HorizontalAlignment = HorizontalAlignment.Center, VerticalAlignment = VerticalAlignment.Top, FontSize = 20, Content = "Click me!" }; myButton.Click += myButton_Click; messageText = new TextBlock { Text = "Message will appear here", TextWrapping = TextWrapping.Wrap, TextAlignment = TextAlignment.Center, FontSize = 30, FontWeight = FontWeights.Bold, HorizontalAlignment = HorizontalAlignment.Center, VerticalAlignment = VerticalAlignment.Center }; LayoutRoot.Children.Add(myButton); LayoutRoot.Children.Add(messageText);

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File extensions aren t all bad!

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Each element that had an x:Name attribute has been replaced here with a field in the class, and we initialize that field in the constructor This example uses the C# object initializer syntax to set the property values to emphasize the structural similarity between this code and the Xaml it replaces, but normal property setter syntax works too, of course XML attribute values are just text, whereas in C# we have to provide values of the correct type enumeration entries, numbers, or strings as appropriate The Xaml compiler works out how to turn text into something of the appropriate type (It uses the NET Framework class library s TypeConverter system to do this.

) Also, as you will recall C# uses a different syntax to attach event handlers than the one for setting properties we ve used the += syntax here whereas Xaml uses attribute syntax for both properties and event handlers This code has the same effect as Xaml Xaml is really just a language for creating objects, setting their properties, and attaching event handlers, so for the most part it doesn t really matter whether you use C# or Xaml to create your user interface This raises the question of why we have Xaml at all, when C# seems to work perfectly well The main reason Xaml exists is to make it possible to create user interfaces in tools other than a text editor For example, Microsoft offers a program called Expression Blend, part of its Expression family of design-oriented programs.

Reading this chapter so far, you might think that all file extensions are bad, but that isn t the case. Knowing when information will be useful to the user is key to understanding when to use a file extension. Is it useful for the user to know that HTML has been generated from an .aspx source file No, the MIME type is sufficient to influence how that content is displayed, so no extension should be shown. But if a Word document is being served, it would be good practice to include a .doc extension in addition to setting the correct MIME type, because that will be useful when the file is downloaded to the user s computer.

Blend is a tool for creating WPF and Silverlight user interfaces, and it works mostly in Xaml This separation is more than just a convenience for people wanting to write design tools It s useful to both developers and designers It enforces some separation, making it possible for designers to work on the visual design of an application, without needing tools that can edit C# source files In fact, successful collaboration between developers and designers takes a bit more than this the separation of Xaml and code behind is not in itself sufficient, because it s still fairly easy for designers and developers to trip over one another.