RegisterPage.xaml

<Page x:Class="IoT1.RegisterPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:IoT1"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="RegisterPage" Background="AliceBlue">

    <StackPanel Margin="20">



        <Label Content="Register" Foreground="Black" HorizontalAlignment="Center" FontSize="24"
               FontWeight="Bold"/>



        <Label Content="Username" FontSize="20" FontWeight="Bold" HorizontalAlignment="Center"/>
        <TextBox x:Name="txt_Username" Background="White" Width="592" Height="31" FontSize="18"/>

        <Label Content="Password" FontSize="20" FontWeight="Bold" HorizontalAlignment="Center"/>
        <PasswordBox x:Name="txt_Password" Background="White" Width="585" Height="31" FontSize="18"/>


        <Button Content="Register" Width="213" Margin="30" Click="Button_Click"/>

    </StackPanel>

</Page>