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<Window x:Class="WindowApp.PasswordWindow"

        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"

        xmlns:local="clr-namespace:WindowApp"

        mc:Ignorable="d"

        Title="Авторизация" SizeToContent="WidthAndHeight" WindowStartupLocation="CenterScreen">

    <Grid Margin="10">

        <Grid.RowDefinitions>

            <RowDefinition Height="20" />

            <RowDefinition Height="20" />

            <RowDefinition Height="Auto" />

        </Grid.RowDefinitions>

        <TextBlock>Введите пароль:</TextBlock>

        <TextBox Name="passwordBox" Grid.Row="1" MinWidth="250">Пароль</TextBox>

        <WrapPanel Grid.Row="2" HorizontalAlignment="Right" Margin="0,15,0,0">

            <Button IsDefault="True" Click="Accept_Click" MinWidth="60" Margin="0,0,10,0">OK</Button>

            <Button IsCancel="True" MinWidth="60">Отмена</Button>

        </WrapPanel>

    </Grid>

</Window>

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using System.Windows;

namespace WindowApp

{

    public partial class PasswordWindow : Window

    {

        public PasswordWindow()

        {

            InitializeComponent();

        }

        private void Accept_Click(object sender, RoutedEventArgs e)

        {

            this.DialogResult = true;

        }

        public string Password

        {

            get { return passwordBox.Text; }

        }

    }

}

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<Window x:Class="WindowApp.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"

        xmlns:local="clr-namespace:WindowApp"

        mc:Ignorable="d"

        Title="MainWindow" Height="250" Width="300">

    <Grid>

        <Button Width="100" Height="30" Content="Авторизация" Click="Login_Click" />

    </Grid>

</Window>

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private void Login_Click(object sender, RoutedEventArgs e)

{

    PasswordWindow passwordWindow = new PasswordWindow();

    if(passwordWindow.ShowDialog()==true)

    {

        if(passwordWindow.Password=="12345678")

            MessageBox.Show("Авторизация пройдена");

        else

            MessageBox.Show("Неверный пароль");

    }

    else

    {

        MessageBox.Show("Авторизация не пройдена");

    }

}