Implementing the WalkDistancePage code using C#

Now that we have defined our user interface for our ContentPage using XAML, the next step is to begin creating the underlying C# code within our WalkDistancePage code-behind file, which will be used to interact with our Map control and place a pin placeholder that will contain information relating to the chosen trail from the ListView control that is contained within our WalksMainPage.

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

Open the WalkDistancePage.xaml.cs code-behind file, ensuring that it is displayed within the code editor, and enter the following code snippet:

    //
    //  WalkDistancePage.xaml.cs
    //  Displays related trail information within a map using a pin placeholder
    //
    //  Created by Steven F. Daniel on 14/05/2018
    //  Copyright © 2018 GENIESOFT STUDIOS. All rights reserved.
    //
    using System;
    using TrackMyWalks.Models;
    using Xamarin.Forms;
    using Xamarin.Forms.Maps;...