Xamarin.Forms: How to identify website link broken or not reachable in Webview (C# - Xaml)

Introduction:
We know that WebView is a view for displaying web and HTML content in your app. Due to security, sometimes website links will not work with outside network, so we need to identify it to show custom dialog to user. 

Xamarin.Forms: how to prevent to open specific Url links from WebView (C# - Xaml)

Introduction:
We know that WebView is a view for displaying web and HTML content in your app. Due to security, sometimes we may need to restrict to open specific urls in our app.