Create Global variable in ASP.Net Core MVC

Hello All,

In my WPF app I would normally create a global variable at the top of a class to hold data that is coming in on my websocket.

What should I do for a .Net Core Application? Web Application.

I would like to store all my data in a object that I can access it throughout my controller.

Currently when I try this the object gets set to null each time I call it.

What is the best way to do something like this? I was looking at a memorycache I think it was called. Maybe something like that or what are my options?

public class HomeController : Controller
{
    public List<SocketResult> lstTrades { get; set; } = new List<SocketResult>();
     
    public HomeController(ILogger<HomeController> logger, IHttpClientFactory httpClient, IHttpContextAccessor httpContextAccessor, IMarketFeed marketFeed, IBinanceSocketClient binanceSocketClient)
    {
        _logger = logger;
        _httpClient = httpClient;
        _httpContext = httpContextAccessor;
        _marketFeed = marketFeed;
        _binanceSocketClient = binanceSocketClient;         
    }
 
    [HttpPost]
    public async Task<IActionResult> AddDataToMemory(string model)
    {
        if (model != null)
        {
            lstTrades.Add(new SocketResult() {Price = model.p });
        }
 
        return NoContent();
    }
}