XAML - Dialog Box

All standalone applications have a main window that exposes some functionality and displays some data over which the application operates through its GUI. An application may also display additional windows to do the following −

• To display some specific information to users.
• To gather useful information from users.
• To both display and gather important information.

Example

Lets have a look at the following example. On the main window, there is a button and a textbox. When the user clicks this button, it opens another dialog box with Yes, No, and Cancel buttons and displays a message on it that prompts the user to click a button.

When the user clicks a button, then the current dialog box gets closed and shows a textbox with the information "which button has been clicked".

Here is the XAML code to create and initialize a button and a textbox with some properties −

<Window x:Class = "XAMLDialog.MainWindow" 
   xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml"
   Title = "MainWindow" Height = "350" Width = "604"> 
	
   <Grid> 
      <Button Height = "23" 
         Margin = "100" 
         Name = "ShowMessageBox" 
         VerticalAlignment = "Top" 
         Click = "ShowMessageBox_Click">Show Message Box</Button>
			
      <TextBox Height = "23" 
         HorizontalAlignment = "Left" 
         Margin = "181,167,0,0" 
         Name = "textBox1" 
         VerticalAlignment = "Top" 
         Width = "120" /> 
   </Grid> 
</Window>

Given below is the C# code to implement a button click event.

using System; 
using System.Windows; 
using System.Windows.Controls;

namespace XAMLDialog {
   /// <summary> 
      /// Interaction logic for MainWindow.xaml 
   /// </summary> 
	
   public partial class MainWindow : Window {
      public MainWindow() { 
         InitializeComponent(); 
      } 
      private void ShowMessageBox_Click(object sender, RoutedEventArgs e) { 
         string msgtext = "Click any button"; 
         string txt = "My Title"; 
         MessageBoxButton button = MessageBoxButton.YesNoCancel;
         MessageBoxResult result = MessageBox.Show(msgtext, txt, button);

         switch (result) { 
            case MessageBoxResult.Yes: 
               textBox1.Text = "Yes"; 
               break;
            case MessageBoxResult.No: 
               textBox1.Text = "No"; 
               break; 
            case MessageBoxResult.Cancel: 
               textBox1.Text = "Cancel"; 
               break; 
         }
      }
   }
}

When you compile and execute the above code, it will produce the following output −

When you click on the button, it displays another dialog box as shown below that prompts the user to click a button. Now, click the Yes button.

It updates the textbox with the button content.