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I am working through the "Get Started with ASP.NET Core MVC" tutorial at the link below:

https://docs.microsoft.com/en-us/aspnet/core/tutorials/first-mvc-app/start-mvc?view=aspnetcore-6.0&tabs=visual-studio

On the "Create New" page, where the user can enter a new movie into the database, the "Rating" field is a text field where the user can enter a string of length five. I'd like to change that to a dropdown menu with the following options to choose from: G, PG, PG-13, R.

How would I go about doing this?

What I have tried:

I believe the C# code for the dropdown would look something like this:

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using System.Collections.Generic;
     
public IActionResult Index()
{
     List<SelectRating> rating = new()
     {
                new SelectRating { Value = "1", Text = "G" },
                new SelectRating { Value = "2", Text = "PG" },
                new SelectRating { Value = "3", Text = "PG-13" },
                new SelectRating { Value = "4", Text = "R" }
            };

            ViewRating.ratings = ratings;
            return View();
}


But I'm not sure where this code would go, and I'm not sure what View file I should edit. Would it be Index.cshtml in the directory /Views/Movies?

/Views/Movies/Index.cshtml

@model MovieDBApp.Models.MovieGenreViewModel

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

<h1>Index</h1>

<p>
    <a asp-action="Create">Create New</a>
</p>

<form asp-controller="Movies" asp-action="Index" method = "get">
    <p>
        <select asp-for="MovieGenre" asp-items="Model.Genres"> 
            <option value="">All</option> 
        </select> 

        Title: <input type="text" name="SearchString">
        <input type="submit" value="Filter" />
    </p>
</form>

<table class="table">
    <thead>
        <tr>
            <th>
                @Html.DisplayNameFor(model => model.Movies[0].Title)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Movies[0].ReleaseDate)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Movies[0].Genre)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Movies[0].Rating)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Movies[0].Runtime)
            </th>
            <th></th>
        </tr>
    </thead>
    <tbody>
@foreach (var item in Model.Movies) {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Title)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.ReleaseDate)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Genre)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Rating)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Runtime)
            </td>
            <td>
                <a asp-action="Edit" asp-route-id="@item.Id">Edit</a> |
                <a asp-action="Details" asp-route-id="@item.Id">Details</a> |
                <a asp-action="Delete" asp-route-id="@item.Id">Delete</a>
            </td>
        </tr>
}
    </tbody>
</table>
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