How to create informative toast notification in UWP App

Yes, UWP has Toast Notifications :)

Here is sample code to display simple notification:

private void ShowToastNotification(string title, string stringContent)
{
        ToastNotifier ToastNotifier = ToastNotificationManager.CreateToastNotifier();
        Windows.Data.Xml.Dom.XmlDocument toastXml = ToastNotificationManager.GetTemplateContent(ToastTemplateType.ToastText02);
        Windows.Data.Xml.Dom.XmlNodeList toastNodeList = toastXml.GetElementsByTagName("text");
        toastNodeList.Item(0).AppendChild(toastXml.CreateTextNode(title));
        toastNodeList.Item(1).AppendChild(toastXml.CreateTextNode(stringContent));
        Windows.Data.Xml.Dom.IXmlNode toastNode = toastXml.SelectSingleNode("/toast");
        Windows.Data.Xml.Dom.XmlElement audio = toastXml.CreateElement("audio");
        audio.SetAttribute("src", "ms-winsoundevent:Notification.SMS");

        ToastNotification toast = new ToastNotification(toastXml);
        toast.ExpirationTime = DateTime.Now.AddSeconds(4);
        ToastNotifier.Show(toast);
}

In this article you can find how to customize it:

https://docs.microsoft.com/en-us/windows/uwp/controls-and-patterns/tiles-and-notifications-adaptive-interactive-toasts