UWP - PasswordBox example

MainPage.xaml

<Page
    x:Class="UniversalAppTutorials.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UniversalAppTutorials"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <StackPanel 
        x:Name="stack_panel1" 
        Orientation="Vertical"
        Background="GhostWhite"
        Padding="100"
        >
        <TextBlock
            x:Name="TextBlock1"
            Foreground="Crimson"
            Margin="15"
            FontSize="20"
            />
        <PasswordBox
            x:Name="PasswordBox1"
            Header="Password"
            PlaceholderText="Input your password."
            Width="300"
            MaxLength="20"
            PasswordChar="#"
            PasswordRevealMode="Peek"
            PasswordChanged="PasswordBox1_PasswordChanged"
            />
    </StackPanel>
</Page>

MainPage.xaml.cs

using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml;


namespace UniversalAppTutorials
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        private void PasswordBox1_PasswordChanged(object sender, RoutedEventArgs e)
        {
            // Cast the sender as a PasswordBox
            PasswordBox passwordBox = sender as PasswordBox;

            // Get the PasswordBox inputted string length
            int length = passwordBox.Password.Length;

            if (length > 0)
            {
                TextBlock1.Text = length + " Character(s).";
            }
            else {
                TextBlock1.Text = "Your password entry box is empty.";
            }
        }
    }
}