如何在用户登录时显示HTML元素。(ASP.NET核心MVC，无EF)

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Identity;

public class HomeController : Controller
{
    private readonly UserManager<IdentityUser> _userManager;
    private readonly SignInManager<IdentityUser> _signInManager;

    public HomeController(UserManager<IdentityUser> userManager, SignInManager<IdentityUser> signInManager)
    {
        _userManager = userManager;
        _signInManager = signInManager;
    }

    [HttpPost]
    public IActionResult Login(LoginViewModel model)
    {
        if (ModelState.IsValid)
        {
            var result = await _signInManager.PasswordSignInAsync(model.Username, model.Password, model.RememberMe, lockoutOnFailure: false);
            if (result.Succeeded)
            {
                ViewBag.ShowElement = true; // 传递数据到视图页面
                return RedirectToAction("Index", "Home");
            }
            else
            {
                ModelState.AddModelError(string.Empty, "Invalid login attempt.");
            }
        }
        return View(model);
    }
}

@{
    ViewData["Title"] = "Login";
}

<h2>Login</h2>

@if (ViewBag.ShowElement)
{
    <div class="element">
        <!-- HTML元素的内容 -->
    </div>
}

<form asp-action="Login" method="post">
    <div class="form-group">
        <label for="username">Username:</label>
        <input type="text" class="form-control" id="username" name="Username" required>
    </div>
    <div class="form-group">
        <label for="password">Password:</label>
        <input type="password" class="form-control" id="password" name="Password" required>
    </div>
    <div class="form-group">
        <div class="checkbox">
            <label>
                <input type="checkbox" name="RememberMe"> Remember me
            </label>
        </div>
    </div>
    <button type="submit" class="btn btn-primary">Login</button>
</form>