Most basic of Prism Binding apps

gistfile1.txt

MahVm.cs
--

using Prism.Mvvm;

namespace SmallPrism.ViewModel {
    public class MahVm : BindableBase {
        private string _name;

        public string Name {
            get { return _name; }
            set {
                if (_name == value) return;
                _name = value;
                RaisePropertyChanged(nameof(Name));
            }
        }

        public MahVm() {
            Name = "TweetyPie";
        }
    }
}
--
MainPage.xaml.cs

using Windows.UI.Xaml.Controls;
using SmallPrism.ViewModel;

namespace SmallPrism {
    public sealed partial class MainPage : Page {
        MahVm mahVm = new MahVm();
        public MainPage() {
            this.InitializeComponent();
        }
    }
}
--
MainPage.xaml

<Page
    x:Class="SmallPrism.MainPage"
    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">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <StackPanel Orientation="Vertical">
            <TextBox HorizontalAlignment="Left" Height="40" Margin="52,45,0,0" TextWrapping="Wrap" Text="{x:Bind Path=x.Name, Mode=TwoWay}" 
                     VerticalAlignment="Top" Width="221"/>
            <TextBox HorizontalAlignment="Left" Height="40" Margin="52,45,0,0" TextWrapping="Wrap" Text="{x:Bind Path=x.Name, Mode=TwoWay}" 
                     VerticalAlignment="Top" Width="221"/>
        </StackPanel>
    </Grid>
</Page>