I am trying to execute this code

@model IEnumerable<Quiz.Services.Models.UserQuizViewModel>
@{
    ViewData["Title"] = "Home Page";
}

<div class="text-center">
    <h1 class="display-4">Welcome</h1>
</div>

<table class="table table-sm table-striped table-hover table-bordered">
    <thead>
        <tr>
            <th>Quiz Name</th>
            <th>Action</th>
        </tr>
    </thead>
    <tbody>
        @foreach (var quiz in Model)
        {
            <tr>
                <td>@quiz.Title</td>
                <td>
                    @if (quiz.QuizStatus == QuizStatus.NotStarted)
                    {
                        <a href="#" class="btn btn-success">Start Test</a>
                    }
                    else if (quiz.QuizStatus == QuizStatus.InProgress)
                    {
                        <a href="#" class="btn btn-warning">Continue Test</a>
                    }
                    else
                    {
                        <a href="#" class="btn btn-secondary">View Results</a>
                    }
                </td>
            </tr>
        }
    </tbody>
</table>

in the Index.cshtml file in my simple Asp.Net project. The problem is that the C# code is not working and when I type @ in the file I cannot use neither foreach nor if-statement.
This is my `UserQuizViewModel’

public int QuizId { get; set; }

public string QuizTitle { get; set; } = null!;

public QuizStatus QuizStatus { get; set; }

with QuizStatus enum:

public enum QuizStatus
{
    NotStarted = 0,
    InProgress = 1,
    Finished = 2
}

I thought that I had syntax errors but after some Google search I discover that this code should be valid and working. Should I install some NuGet Packages or something else in order to run this code? This is the content of _ViewImports.cshtml file

@using Quiz.Web
@using Quiz.Web.Models
@using Quiz.Services.Models;
@using Quiz.Services.Models;
@using Quiz.Services.Models.Enums;
@using static Quiz.Common.GeneralApplicationConstants
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers