Binance.Net | .Net API wrapper for the Binance web API | REST library

I'm subscribing to the following event and I wonder what the difference between the following two examples is and do I need to unsubscribe. The library I'm using is Binance.Net by JKorf.

I have a .Net Core application and I’m using the Binance.Net API. I want to show the trades coming in real time and update my View with the current trades. I’m not sure the correct way to do this. Possibly ajax? The data that is coming in is all c# so that makes it harder where I cant use javascript websockets to update the UI. Unless there is a way around this. I have a View and also a partialview with a listbox in it. Currently as the websocket data comes in I add it to a model and if I click the button in my partial the listbox shows the recent trades. So I am partially there.

I'm using TPL Dataflow in order to perform one task per symbol at a time. The first two Operation taking... messages are correct but the next ones are using old data. In other words, it uses the old data marked with green on the screenshot below, instead of the newest data (the blue marked one).

I am using Binance.NET library. It's a wrapper for binance.com api. I want to get the current average price of the Bitcoin.
It seems that the library has no method to do it. Yes, it allows to use tickers, but maybe there is a better way?

I have installed the wrapper from https://github.com/JKorf/Binance.Net

Using their example code, I have the following in my app:

The code below downloads historical OHLCV data from Binance from a start date to an end date. Since Binance allows us to download only 1000 candles at a time, I did DownloadAsync the way it is. Any recommendations onto the code, are appreciated as well.

The actual question is about making DownloadAsync multithreaded, in order to speed up the process, because imagine downloading candles from 2018 to 2021 on 5m interval. I would prefer using System.Reactive, but I guess other solutions are welcome too, since it's hard to represent the code to a multithreading version.

The code below can be tested.

I'm building a candle recorder (Binance Crypto), interesting in 1 minute candles, including intra candle data for market study purpose (But eventually I could use this same code to actually be my eyes on what's happening in the market)

To avoid eventual lag / EF / SQL performance etc. I decided do accomplish this using two threads.

One receives the subscribed (Async) tokens from Binance and put them in a ConcurrentQueue, while another keeps trying to dequeue and save the data in MSSQL

My question goes for the second Thread, a while(true) loop. Whats the best approach to save like 200 + info/sec to SQL while these info come in individually (sometimes 300 info in a matter of 300ms, sometime less) using EF:

Should I open the SQL con each time I want to save? (Performance). Whats the best approach to accomplish this?

-- EDITED -- At one point I got 600k+ in the Queue so I'm facing problems inserting to SQL Changed from Linq to SQL to EF

Here's my actual code:

I'm trying to convert List to List by using user-defined conversion, which doesn't let me do it because ICommonKline is an interface.

user-defined conversions to or from an interface are not allowed

How can I do that?

I'm using Binance.Net NuGet package to download historical candle data from Binance. I have a check whether the candle on each 6-hour interval is green and if it is, it enumerates each 30-minute interval inside the 6-hour interval.

A working example is given in the code below. The snippet basically works but the problem is instead of downloading the candles from Binance's REST once again with GetKlines, it should use the _30m array instead, because it would be too slow to download the data using GetKlines everytime we enumerate them each 6-hour interval candle, that's why I'm pulling the data in the beginning at once and then I can store it, re-use it, etc.

Briefly, I need to find the 30-minute interval candles that belong to the 6-hour intervals.