'does not exist in the current context'

[matty1248]

Can anyone suggest what i'm missing here? I'm just trying to follow a basic guide on UWP apps, it's seems like i'm missing a namespace reference that was in the standard 2015 version but not in 2018. Here is my xaml.cs file, any help appreciated:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at C#, VB, and C++ project templates for Store apps

namespace HelloWorld
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
}

private void MrClick_Click(object sender, RoutedEventArgs e)
{
ResultTextBlock.Text = "Hello Wolrd";
}
}
}

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