Как я могу обнаружить, если Flash установлен, и в противном случае отобразите скрытое отделение, которое сообщает пользователю?

shareInfo - это класс:

public class ShareInfo
        {
            [JsonIgnore]
            public readonly DateTime Timestamp = DateTime.Now;
            [JsonProperty("sharename")]
            public string ShareName = null;
            [JsonProperty("readystate")]
            public string ReadyState = null;
            [JsonProperty("created")]
            [JsonConverter(typeof(Newtonsoft.Json.Converters.UnixDateTimeConverter))]
            public DateTime? CreatedUtc = null;
            [JsonProperty("title")]
            public string Title = null;
            [JsonProperty("getturl")]
            public string GettUrl = null;
            [JsonProperty("userid")]
            public string UserId = null;
            [JsonProperty("fullname")]
            public string Fullname = null;
            [JsonProperty("files")]
            public GettFile.FileInfo[] Files = new GettFile.FileInfo[0];
        }

// POST request.
            var gett = new WebClient { Encoding = Encoding.UTF8 };
            gett.Headers.Add("Content-Type", "application/json");
            byte[] request = Encoding.UTF8.GetBytes(jsonArgument.ToString());
            byte[] response = gett.UploadData(baseUri.Uri, request);

            // Response.
            var shareInfo = JsonConvert.DeserializeObject<ShareInfo>(Encoding.UTF8.GetString(response));