Visual Studio 2019 (WPF C# Source Code & XAML) How to Create a Simple Hello World Program in C# Windows Presentation Foundation (WPF App)

Visual Studio 2019 (WPF C# Source Code & XAML) How to Create a Simple Hello, World! Program in C# Windows Presentation Foundation (WPF Application).

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[XAML & Visual C# Code Behind]

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MainWindow.xaml

<Window x:Class="SimpleHelloWorldCSWpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        Title="WPF (C#) : Simple Hello, World! Program : Code A Minute : iBasskung Tutorial"
        Height="450" Width="800"
        Background="DarkCyan"
        WindowStartupLocation="CenterScreen"
        WindowState="Normal"
        WindowStyle="ThreeDBorderWindow">
 
    <Grid Margin="15">
     
        <StackPanel Orientation="Vertical"
                    HorizontalAlignment="Stretch"
                    VerticalAlignment="Center">

            <TextBlock Name="resultTextBlock"
                       HorizontalAlignment="Center"
                       VerticalAlignment="Top"
                       Text="My TextBlock"
                       TextWrapping="Wrap"
                       FontSize="100"
                       Foreground="Yellow"
                       Margin="0,0,0,30"/>

            <Button Name="sayHelloButton"
                    Content="Let's say Hello :)"
                    FontSize="72"
                    Height="140"
                    Width="740"
                    HorizontalAlignment="Stretch"
                    HorizontalContentAlignment="Center"
                    VerticalAlignment="Stretch"
                    VerticalContentAlignment="Center"
                    Background="MediumVioletRed"
                    Foreground="Gold"
                    BorderBrush="White"
                    BorderThickness="6" Click="SayHelloButton_Click"/>

        </StackPanel>
     
    </Grid>
 
</Window>

=================

MainWindow.xaml.cs

using System;

using System.Windows;

namespace SimpleHelloWorldCSWpfApp

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

            resultTextBlock.Text = "...";

        }

        private void SayHelloButton_Click(object sender, RoutedEventArgs e)

        {

            // Demo by Code A Minute (iBasskung Tutorial).

            if (!resultTextBlock.Text.Equals("Hello, World!"))

            {

                resultTextBlock.Text = "Hello, World!";

            }

            else

            {

                resultTextBlock.Text = "Hello, WPF !!!";

            }

            // Ex.1

            MessageBox.Show("Hello, World! WPF Application.", "Simple WPF (C#) Hello, World! Program", MessageBoxButton.OK, MessageBoxImage.Exclamation);

            // Ex.2

            string caption = "Simple WPF (C#) Hello, World! Program";

            MessageBoxButton btnOK = MessageBoxButton.OK;

            MessageBoxImage imgInfo = MessageBoxImage.Information;

            string message = $"Hello, World!{Environment.NewLine}Hello, WPF Application!";

            MessageBox.Show(message, caption, btnOK, imgInfo);

        }

    }

}