C# check if Twitch steam is online or not

Hello, Thanks for your response. would you be able to tell me if this is the correct way to finish it.

var r = JsonConvert.DeserializeObject<RootObject>(jsonString);
                    if (r.data[0] == null)
                    {
                        
                    }
                    else
                    {
                        return true;
                    }

After your code, this is what i added. I used json2csharp.com and got this:

public class Datum
{
    public string id { get; set; }
    public string user_id { get; set; }
    public string user_name { get; set; }
    public string game_id { get; set; }
    public string type { get; set; }
    public string title { get; set; }
    public int viewer_count { get; set; }
    public DateTime started_at { get; set; }
    public string language { get; set; }
    public string thumbnail_url { get; set; }
    public List<string> tag_ids { get; set; }
}

public class Pagination
{
    public string cursor { get; set; }
}

public class RootObject
{
    public List<Datum> data { get; set; }
    public Pagination pagination { get; set; }
}

Please let me know, appreciate your help