How do I pass value from @html.editorfor(model => model.bookingrefno, new { htmlattributes = new { @class = "form-control", @readonly = "readonly", @name="testname1"} }) to controller?

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ASP.NET-Core

1. this my html
@Html.EditorFor(model => model.BookingRefNo, new { htmlAttributes = new { @class = "form-control", @readonly = "readonly", @name="testname1"} })

2. My Form POST
@using (Html.BeginForm("CloseCustomerOrder", "FoodMasterFile", FormMethod.Post, new { id = "addfrm" }))

3. My model
@model OrderService.Data.Model.CustomerOderTransList

4. my Controller

public async Task<IActionResult> CloseCustomerOrder(string testname1)
      {
          try
          {
              using (HttpClient client = new HttpClient())
              {
                  StringContent content = new StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(user), Encoding.UTF8, "application/json");
                  string endpoint = apiBaseUrl + "/AddOrderTransHdrTbl";

                  using (var Response = await client.PostAsync(endpoint, content))
                  {
                      if (Response.StatusCode == System.Net.HttpStatusCode.OK)
                      {
                          TempData["Profile"] = JsonConvert.SerializeObject(user);
                      }
                      else if (Response.StatusCode == System.Net.HttpStatusCode.Conflict)
                      {

                          ModelState.Clear();
                          ModelState.AddModelError("OrderFormEntry", "Records Already Exist");
                          return View();
                      }
                      else
                      {
                          return View();
                      }
                  }
              }

              return RedirectToAction("ViewCustomerOrderTrans", "CreateFoodOrder");
          }
          catch (ArgumentException ex)
          {
              Console.WriteLine($"Processing failed: {ex.Message.ToString()}");
              throw;
          }
      }

What I have tried:

5. i wanted to get the value of
@Html.EditorFor(model => model.BookingRefNo, new { htmlAttributes = new { @class = "form-control", @readonly = "readonly", @name="testname1"} })

and pass to my controller, it so happen during my click button dont not rout to my controller error page cannot be display 404