Updating the WalksMainPage code-behind using C#

Now that we have created the TwitterSignInPageRenderer class that will be responsible for displaying the Twitter UI dialog, our next step is to begin updating the underlying C# code within our WalksMainPage code-behind file. This will give it the ability to display our TwitterSignInPage ViewModel if we haven't determined that the user has signed in.

Let's take a look at how we can achieve this by following these steps:

1. Locate and open the WalksMainPage.xaml.cs file, which is located within the Views folder, ensuring that it is displayed within the code editor, and enter the following highlighted code sections:

    //
    //  WalksMainPage.xaml.cs
    //  Displays Walk Information within a ListView control from an array 
    //
    //  Created by Steven F. Daniel on 14/05/2018
    //  Copyright © 2018 GENIESOFT STUDIOS...