How do I properly pass the values to the textboxes editfor

[HttpGet]
public async Task GetCustomerMasterFile(int id)
{
	List CodeListing = new List();
	using (var httpClient = new HttpClient())
	{

		using (var response = await httpClient.GetAsync(
		    apiBaseUrl + "/GetCustomerMasterFileTbl?id=" + id))
		{
			string apiResponse = await response.Content.ReadAsStringAsync();
			CodeListing = JsonConvert.DeserializeObject>(apiResponse)!;
		}
	}
	var model = new GetCustomerMasterFileTbl
	{
		CustomerMasterFileJVM = CodeListing
	};

	foreach (var item in CodeListing)
	{
		model.CustomerIDno = item.CustomerIDno;
		model.LastName = item.LastName;
		model.FirstName = item.FirstName;
		model.MiddleName = item.MiddleName;
		model.BirthDate = item.BirthDate;

		model.Gender = item.Gender;
		model.CustomerAddress = item.CustomerAddress;
		model.ContactPerson = item.ContactPerson;
		model.ContactNumber = item.ContactNumber;
		model.CustomerEmail = item.CustomerEmail;

		model.CreatedBy = item.CreatedBy;
	}

	return View(model);
}

public class GetCustomerMasterFileTbl
{
	public string? CustomerIDno { get; set; }
	public string? LastName { get; set; }
	public string? FirstName { get; set; }
	public string? MiddleName { get; set; }
	public DateTime? BirthDate { get; set; }
	public string? Gender { get; set; }
	public string? CustomerAddress { get; set; }
	public string? ContactPerson { get; set; }
	public string? ContactNumber { get; set; }
	public string? CustomerEmail { get; set; }
	public string? CreatedBy { get; set; }
	public DateTime DateCreated { get; set; }
	public string? Status { get; set; }
	public required List CustomerMasterFileJVM { get; set; }
}

@model CustomerService.Data.odel.AddCustomerMasterFileTbl

Customer Information
			Settings 1
			Settings 2

@using (Html.BeginForm("AddCustomerMasterFile",
                       "CustomerMasterFile",
 					   FormMethod.Post,
					   new { id = "addfrm" }))
{
    @Html.AntiForgeryToken()
	
    L-Name*
    @Html.TextBoxFor(m => m.LastName,
	                 new { @class = "form-control", required="required"})

	F-Name*
    @Html.TextBoxFor(m => m.FirstName,
                     new { @class = "form-control",  required="required"})

	Initial
    @Html.TextBoxFor(m => m.MiddleName,
	                 new { @class = "form-control", required="required"})

    B-Date *
    @Html.TextBoxFor(m => m.BirthDate,
                     new { @class = "form-control", placeholder="dd-mm-yyyy", required="required",   onfocus="this.type='date'",   onmouseover="this.type='date'", onclick="this.type='date'", onblur="this.type='text'" , onmouseout="timeFunctionLong(this)" })

    function timeFunctionLong(input) {
        setTimeout(function () {
            input.type = 'text';
        }, 60000);
    }

    Gender *
    @Html.DropDownListFor(model => model.Gender,
                          new List
						  {
						      new SelectListItem { Value = "M" , Text = "Male" },
							  new SelectListItem { Value = "F" , Text = "Female" }},
						  new { @class="form-control"})

    Address*
    @Html.TextBoxFor(m => m.CustomerAddress,
                     new { @class = "form-control",  required="required"})
		
    Reference*
    @Html.TextBoxFor(m => m.ContactPerson,
	                 new { @class = "form-control",  required="required"})

    Contact No*
    @Html.TextBoxFor(m => m.ContactNumber,
	                 new { @class = "form-control",  required="required"})

    Email*
    @Html.TextBoxFor(m => m.CustomerEmail,
	                 new { @class = "form-control",  required="required"})

    Created By*
    @Html.TextBoxFor(m => m.CreatedBy,
                     new { @class = "form-control", required="required"})

    Cancel
    Submit
}

@if (ViewBag.Message != null)
{
		window.onload = function () {
			alert("@ViewBag.Message");
		};
}

@Html.ActionLink("Edit", "GetCustomerMasterFile",
                 new { id = @post.CustomerIDno },
				 new { @class = "btn btn-success btn-sm",
				 data_toggle = "modal",
				 data_target = "#new-edit-modal" })  
				 
@Html.ActionLink("Delete", "DeleteCustomer",
				 new { id = @post.CustomerIDno },
				 new { @class = "btn btn-primary btn-sm",
				 data_toggle = "modal",
				 data_target = "#new-delete-modal" })