Universal Windows Platform – Custom Dialog

Custom Dialog shows how to use the ContentDialog to display a customised popup dialog

Step 1

If not already, follow Setup and Start on how to Install and get Started with Visual Studio 2017 or in Windows 10 choose Start, and then from the Start Menu find and select Visual Studio 2017.


Step 2

Once Visual Studio Community 2017 has started, from the Menu choose File, then New then Project…


Step 3

From New Project choose Visual C# from Installed, Templates then choose Blank App (Universal Windows) and then type in a Name and select a Location and then select Ok to create the Project

Step 4

Then in New Universal Windows Project you need to select the Target Version this should be at least the Windows 10 Fall Creators Update (10.0; Build 16299) and the Minimum Version to be the same.


The Target Version will control what features your application can use in Windows 10 so by picking the most recent version you’ll be able to take advantage of those features. To make sure you always have the most recent version, in Visual Studio 2017 select Tools Extensions and Updates… then and then see if there are any Updates

Step 5

In the Solution Explorer select MainPage.xaml


Step 6

From the Menu choose View and then Designer


Step 7

The Design View will be displayed along with the XAML View and in this between the Grid and /Grid elements, enter the following XAML:

<Button Content="Display" HorizontalAlignment="Center" Click="Button_Click"/>

The Button will be used to trigger a Click Event called Button_Click

Step 8

From the Menu choose View and then Code


Step 9

Once in the Code View, below the end of public MainPage() { … } the following Code should be entered:

private async void Button_Click(object sender, RoutedEventArgs e)
	ContentDialog dialog = new ContentDialog()
		Title = "Custom Dialog",
		MaxWidth = this.ActualWidth,
		PrimaryButtonText = "Close",
		Content = new TextBlock
			Style = (Style)App.Current.Resources["SubheaderTextBlockStyle"],
			Text = "Hello World",
	await dialog.ShowAsync();

The Button_Click is an Event that will be triggered when the Button is Clicked, within this is a ContentDialog with the Content set to a TextBlock using a System Style and displayed with ShowAsync

Step 10

That completes the Universal Windows Platform Application so Save the Project then in Visual Studio select the Local Machine to run the Application


Step 11

Once the Application has started running tap the Display Button to show the Custom Dialog and Close to dismiss it.


Step 12

To Exit the Application select the Close button in the top right of the Application


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