Windows.UI.Notifications is missing
<p>I want to create simple toast notification to action center in windows 10 from <a href="https://blogs.msdn.microsoft.com/tiles_and_toasts/2015/07/08/quickstart-sending-a-local-toast-notification-and-handling-activations-from-it-windows-10/" rel="noreferrer">this example</a>. But I got problem on Step 2:</p>

<pre><code>using Windows.UI.Notifications;
</code></pre>

<p>It`s missing. But I have spent a lot of time to find it and got no result. I really have no idea where I can find or at least download it.</p>

<p>What I tried:</p>

<ol>
<li>After long search I found <code>Windows.UI.dll</code> in <code>C:\Windows\System32</code> but when I try to add it as reference into project I got this error. Even after I tried to copy it and made this fully accessible nothing changed</li>
</ol>

<p><a href="https://i.stack.imgur.com/x8KxT.png" rel="noreferrer"><img src="https://i.stack.imgur.com/x8KxT.png" alt="enter image description here"></a></p>

<ol start="2">
<li>I tried to reinstall .Net (I`m using 4.5.2)</li>
<li>Installed Windows 10 SDK</li>
<li>Tried to import with global </li>
<li>Added</li>
</ol>

<blockquote>
<pre><code>&lt;PropertyGroup&gt;
      &lt;TargetPlatformVersion&gt;10.0&lt;/TargetPlatformVersion&gt;
&lt;/PropertyGroup&gt;
</code></pre>
</blockquote>

<ol start="6">
<li>Added <code>System.Runtime.dll</code> reference</li>
</ol>

<p>Example code which probably is useless for you:</p>

<pre><code>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Toolkit.Uwp.Notifications;
using Microsoft.QueryStringDotNET;
using Windows.UI.Notifications;


namespace MessagerClient.Notifications {
    class DefaultWindowsNotification {

        public static void notificationTest() {
            string title = "Andrew sent you a picture";
            string content = "Check this out, Happy Canyon in Utah!";
            string image = "http://blogs.msdn.com/something.jpg";
            string logo = "ms-appdata:///local/Andrew.jpg";
            ToastVisual visual = new ToastVisual() {

                BindingGeneric = new ToastBindingGeneric() {

                    Children =
                    {
                        new AdaptiveText()
                        {
                            Text = title
                        },

                        new AdaptiveText()
                        {
                            Text = content
                        },

                        new AdaptiveImage()
                        {
                            Source = image
                        }
                    },

                    AppLogoOverride = new ToastGenericAppLogo() {
                        Source = logo,
                        HintCrop = ToastGenericAppLogoCrop.Circle
                    }
                }
            };
            Console.WriteLine("NOTIFICATION");
            //Can`t use because of Windows.UI library
            ToastNotificationManager.CreateToastNotifier().Show(visual);
        }
    }
}
</code></pre>