Validating an index

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Message Box lets you configure the message box text, title, icon, and buttons, using code like the following. User Page Range Enabled = true; // Show save file dialog box Nullable' Configure printer dialog box Dim dlg As New Print Dialog() dlg. As we'll see, a dialog box is a window with special behaviors.

// Configure the message box to be displayed string message Box Text = "Do you want to save changes? Window implements those behaviors and, consequently, you use Window to create custom modal and modeless dialog boxes.

A modeless dialog box at least provides a Close button to close the dialog box, and may provide additional buttons to execute specific functions, such as a Find Next button to find the next word that matches the find criteria of a word search.

Windows Presentation Foundation (WPF) allows you to create several types of dialog boxes, including message boxes, common dialog boxes, and custom dialog boxes.

Because these dialog boxes are available to all applications and because they help provide a consistent user experience, they are known as . File Name End If The save file dialog box, shown in the following figure, is used by file saving functionality to retrieve the name of a file to save. After the dialog box is configured, it is shown modally by calling the Show Dialog method. To associate the validation rule with the bound control, you use the following markup.

Windows Presentation Foundation (WPF) encapsulates the open file, save file, and print common dialog boxes and exposes them as managed classes for you to use in standalone applications. The open file dialog box, shown in the following figure, is used by file opening functionality to retrieve the name of a file to open. The common save file dialog box is implemented as the Save File Dialog class, and is located in the Microsoft. The following code shows how to create, configure, and show one, and how to process the result. When a dialog box is opened and the user provides the required data, a dialog box is responsible for ensuring that the provided data is valid for the following reasons: To validate a bound control in WPF, you need to define a validation rule and associate it with the binding. Once the validation rule is associated, WPF will automatically apply it when data is entered into the bound control.

For example, if a user wants to find occurrences of a particular word in a document, a main window will often open a dialog box to ask a user what word they are looking for.

" Dim caption As String = "Word Processor" Dim button As Message Box Button = Message Box Button. Although Message Box may offer a simple dialog box user experience, the advantage of using Message Box is that is the only type of window that can be shown by applications that run within a partial trust security sandbox (see Security), such as XAML browser applications (XBAPs). A dialog box is typically shown as a result of a user selecting a menu item to perform a domain-specific function, such as setting the margins of a document in a word processor.

Get Children(node) If (Type Of subnode Is Dependency Object And Also Not Me.

Is Valid(Direct Cast(subnode, Dependency Object))) Then ' If a child dependency object is invalid, return false immediately, ' otherwise keep checking Return False End If Next ' All dependency objects are valid Return True End Function End Class End Namespace , and the window is considered invalid.

This is good behavior for a dialog box; a user should be able to freely navigate the controls in a dialog box whether or not data is valid.

However, this means a user can enter invalid data and press the OK button.

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