kk/Captcha/MainWindow.xaml

<Window x:Class="Captcha.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:Captcha"
        mc:Ignorable="d"
        Title="MainWindow" Height="500" Width="800">
    <Grid>
        <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center" Height="304" Margin="328,86,275.6,80.4" Width="190">
            <GroupBox Header="Логин">
                <TextBox x:Name="Login" />
            </GroupBox>
            <GroupBox Header="Пароль">
                <PasswordBox x:Name="Password" />
            </GroupBox>
            <Button x:Name="loginBtn" Content="Войти"/>
            <StackPanel>
                
                <Image Height="104" Margin="0,0,-0.6,0" x:Name="grf" Width="190"/>
                <Button x:Name="reload" Content="Другая капча"></Button>
            </StackPanel>
        </StackPanel>
    </Grid>
</Window>