Trying to query custom Assistant in C# not getting assistant answers

API
2

I haven’t gone through it all but it looks like at the very least, you are forgetting to pass in your data here:

var content = new StringContent(JsonConvert.SerializeObject(requestData), Encoding.UTF8, "application/json");
var response = await _httpClient.PostAsync("https://api.openai.com/v1/threads", null);