C#

void DefineAssociations(string extension, string IconFile)
{
string keyName = extension;
RegistryKey key = Registry.ClassesRoot.OpenSubKey(keyName);
if (key != null)
{
string apppath = "";
apppath = Application.ExecutablePath.ToLower() + " \"%1\"";
key.SetValue("", "MyProg");
 
RegistryKey iconkey;
iconkey = key.CreateSubKey("DefaultIcon");
iconkey.SetValue("", Environment.CurrentDirectory + "\\resources\\" + IconFile);
key = key.CreateSubKey("shell");
key = key.CreateSubKey("open");
key = key.CreateSubKey("command");
key.SetValue("", apppath);
}
}

<Grid>
    <ListView x:Name="lsvItems" VerticalAlignment="Top" HorizontalAlignment="Stretch">
        <ListView.ItemsPanel>
            <ItemsPanelTemplate>
                <ItemsWrapGrid Orientation="Horizontal"></ItemsWrapGrid>
            </ItemsPanelTemplate>
        </ListView.ItemsPanel>
        <ListView.ItemTemplate>
            <DataTemplate>
                <StackPanel>
                    <Grid>
                        <Ellipse Stroke="Black" Width="180" Height="180" StrokeThickness="0.9" Margin="0,5">
                            <Ellipse.Fill>
                                <ImageBrush ImageSource="/Asets/nologo.jpg"></ImageBrush>
                            </Ellipse.Fill>
                        </Ellipse>
                        <Ellipse Stroke="Black" Width="180" Height="180" StrokeThickness="0.9" Margin="0,5">
                            <Ellipse.Fill>
                                <ImageBrush ImageSource="{Binding thumbail}"></ImageBrush>
                            </Ellipse.Fill>
                        </Ellipse>
                    </Grid>

                    <StackPanel Margin="0,5">
                        <TextBlock Text="{Binding title}" Foreground="White" FontWeight="SemiBold" OpticalMarginAlignment="TrimSideBearings" TextTrimming="CharacterEllipsis" FontSize="15" Margin="2" ></TextBlock>
                        <TextBlock Text="{Binding user.full_name}" Foreground="White" FontSize="12" Margin="2"></TextBlock>
                    </StackPanel>
                </StackPanel>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>

</Grid>

 public class Track
        {
            public string urn { get; set; }
            public string uri { get; set; }
            public string permalink { get; set; }
            public string permalink_url { get; set; }
            public string title { get; set; }
            public string description { get; set; }
            public string track_type { get; set; }
            public string genre { get; set; }
            public string tag_list { get; set; }
................
         }
 public class RootObject
        {
            public List<Track> tracks { get; set; }
            public string tag { get; set; }
            public string next_href { get; set; }
        }

public class StaticMethod
{

    public static async Task<string> GetJsonStringTask(string link)
    {
        HttpClient client = new HttpClient();
        HttpResponseMessage message = await client.GetAsync(link+ "&client_id=9ac2b...");
        string result = await message.Content.ReadAsStringAsync();
        return result;
    }
}

public ObservableCollection<TracksModel> TrackCollection = new ObservableCollection<TracksModel>();

        public async Task GetTrackAsyncTask(string link)
        {
            var result = await StaticMethod.GetJsonStringTask(link);
            if(result!=null)
            {
                **var getItem = JsonConvert.DeserializeObject<TracksSoundCloud.RootObject>(result);
                if(Do not get a error)
                   { give data to listview}
                  else
                     return a error and show up on listview or show messagebox.
            }**
        }

 var getItem = JsonConvert.DeserializeObject<TracksSoundCloud.RootObject>(result);

if(Do not get a error)

{ give data to listview}

 else

 return a error and show up on listview or show messagebox.
 }