Let us assume there is a requirement,

1. On click event of button, a new child window should open.

2. While child window is open, the parent window should be inactive.

So start with

Step 1

Create a WPF application. And drag and drop a Button on the MainPage.

clip_image002

Step 2

Right click on the WPF project and new item and select a WPF Window from WPF tab. Rename window to ChildWindow.xaml

clip_image004

Step 3

Now on the click event of button child window will get open.

clip_image006

On the button click event

1. An instance of Child window is being created

2. Then ShowDialog() method is being called to open the child window .

MainPage.Xaml.cs


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication2
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            BtnNewWindow.Click += new RoutedEventHandler(delegate(object sender, RoutedEventArgs e)
                                                          {
                                                              ChildWindow chldWindow = new ChildWindow();
                                                              MessageBox.Show(chldWindow.Getmessage());
                                                              chldWindow.ShowDialog();
                                                          });



        }


    }
}

So on running on the click of button new child window being open.

clip_image007

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