Unable to show web API data in a listview in visual studio 2017-xamarin

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C#

XAML

ListView

Xamarin

I am developing a cross platform app in Xamrin with Visual Studio 2017. Have made a simple form for testing with just one listview. I am trying to GetData from my WebAPI and show it in a listview. I checked my web API end points using Postman and its working perfectly alright. But my listview does not show any data . Trying desperately to find out what is it that is creating the problem . My code from XAML , .CS file and View Model is as shown below.



What is it that I am doing wrong here????? Its been quite a long time since I have been trying to figure out why my listview is not showing my data. Any kind of help will be appreciated.

What I have tried:

VIEW MODEL CODE:

 public class MainViewModel : INotifyPropertyChanged

{

 public class ItemDetailsClass

    {
        public string ItemCode { get; set; }

        public string ItemDesc { get; set; }
    }

 public ObservableCollection<ItemDetailsClass> ItemsListMain
    {
        get { return _itemsListMain; }
        set
        {
            _itemsListMain = value;
            OnPropertyChanged();
        }
    }


public async Task <ObservableCollection<ItemDetailsClass>> GetAsync()

    {
        var httpClient = new HttpClient();
        var json = await httpClient.GetStringAsync(WebServiceUrl);
        var taskModels = JsonConvert.DeserializeObject<ObservableCollection<ItemDetailsClass>>
    (json); 
    return taskModels;

    }

    private async Task InitaializeDataAsync()

    {
        ItemsListMain = await GetAsync();

    }

   public MainViewModel()
    {
        InitaializeDataAsync();
    }

}

XAML CODE:

<ContentPage.BindingContext>

    <viewModels:MainViewModel/>

</ContentPage.BindingContext>



 <ListView

    x:Name="MyListView"
    ItemsSource="{Binding ItemsListMain}"
    CachingStrategy="RecycleElement"
    HasUnevenRows="True"
    IsVisible="True">


<ListView.ItemTemplate>
  <DataTemplate>
    <TextCell Text="{Binding ItemCode}" TextColor="Black"/>
  </DataTemplate>
</ListView.ItemTemplate>
</ListView>

Page.Cs CODE

MainViewModel myViewModel = new MainViewModel();
 MyListView.BindingContext = myViewModel;