configureawait.cs

private async Task FetchData()
{
    var service = new ResourcesService();
    var result = await service.FetchAllResources();
    
    //textblock is bound against Json
    Json = result
}

public class ResourcesService
{
    public async Task<string> FetchAllResources()
    {
        var client = RestClient.GetClientInstance();
        var result = await client.GetAsync(Constants.ApiCallUrl).ConfigureAwait(false);
        string json = await result.Content.ReadAsStringAsync().ConfigureAwait(false);

        return json;
    }
}