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<Label Grid.Row="0" Grid.Column="0" >Input: </Label> <TextBox Name="input" Grid.Column="1" Text="hello" /> <Label Name="output" Grid.Row="0" Grid.Column="2" ></Label> <Button Name="press" Grid.Column="3" >Press Me</Button> </Grid> </Window> To make this XAML definition of a form useful, you need to do two things. First, you must load the form s definition and show it to the user; however, doing only this will offer no interaction with the user. Thus, the second thing you need to do is make the form interactive. To do this, you use F# to add event handlers to the controls; in this case, you use it to add an event handler to the button that places the contents of the textbox into the second label. The function createWindow is a general-purpose function for loading a XAML form. You then use this function to create the value window, and you pass this value to the form s FindName method to find the controls within the form, so you can interact with them. Finally, you create an instance of the Application class in the main function and use this to show the form (see Listing 8-6). Listing 8-6. Displaying the XAML Form and Adding Event Handlers to It open open open open open open System System.Collections.Generic System.Windows System.Windows.Controls System.Windows.Markup System.Xml

In recent years there has been a shift away from printed documentation. The occasional weighty manual (like the book you re holding now) is still required for learning advanced tools, but the average piece of office productivity or business software no longer assumes the user is willing to perform any additional reading. Instead, these programs are heavily dependent on natural, instinctive interfaces, and use online Help to patch the gaps and answer the occasional user question. Online Help doesn t have to take the form of a second-rate user manual, however. The advantages of online Help are remarkable: Increased control. With a little effort, you can determine exactly what information users see when they click the F1 key. With a printed book, users might look for information using the index, table of contents, or even a third-party For Dummies guide, and you have no way of knowing what they will find. Rich media. With online Help you can use as many pictures as you want, in any combination, and even include sounds, movies, and animated demonstrations.

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remind you what it is, you have no other option available than to completely reinstall Windows Home Server and create a new password.

Searching tools and context-sensitivity. Help systems can automate most of the drudgery associated with finding information. They can look for keywords with a full-text search (rather than relying on a human-compiled index), and programs can use context-sensitivity to make sure users see the appropriate topic immediately. All Help standards provide these advantages in one form or another.

Have you ever had this experience You find an unusual option buried deep in an application, and it piques your curiosity You hit F1, curious to find out what this option accomplishes But your optimism dwindles when you read the description provided by the context-sensitive Help system: To enable option X, click once on the option X check box To disable option X, click the option X check box again to remove the check mark Click OK to save your changes Clearly something is missing here You want to know what option X does; the Help wants to explain, in oddly explicit detail, how to use a check box The situation is ridiculous, as the function of option X is not at all obvious, but the way to use a check box is instinctive to every computer user.

// creates the window and loads the given XAML file into it let createWindow (file : string) = using (XmlReader.Create(file)) (fun stream -> (XamlReader.Load(stream) : > Window)) // create the window object and add event handler // to the button control let window = let temp = createWindow "Window1.xaml" let press = temp.FindName("press") : > Button let textbox = temp.FindName("input") : > TextBox let label = temp.FindName("output") : > Label press.Click.Add (fun _ -> label.Content <- textbox.Text ) temp // run the application let main() = let app = new Application() app.Run(window) |> ignore [<STAThread>] do main()

If you don t know how to use a check box, you probably wouldn t have guessed to press the F1 key for Help This is an example of classic bad Help Some of the characteristics of bad Help include: It describes the user interface Users don t need to know how the interface works they can often discover that by trial and (occasionally) error Instead, users need to know what tasks the application performs It s excessively long Help doesn t have the same bandwidth as a printed document, and endless scrolling is sure to frustrate users It uses visual clues Instructing the user to look at the top left or middle right may seem logical enough, but with the application running in another (potentially minimized) window, it can cause confusion It omits information Printed documents can afford to choose what they cover.

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