my-old-website/MyWebsite/MyWebsite/Areas/Admin/Views/Badges/Create.cshtml

@model MyWebsite.Models.BadgeModel
@using System.IO;
@{
    ViewData["Title"] = "Create badge";
    List<SelectListItem> files = new List<SelectListItem>();
    foreach (string path in Directory.GetFiles(Directory.GetCurrentDirectory() + "/wwwroot/images/Badges"))
    {
        string fileName = System.IO.Path.GetFileNameWithoutExtension(path);
        files.Add(new SelectListItem(fileName, fileName));
    }
}

<header>
    <p>&#xE760; <a asp-action="Index">Back to the list</a></p>
    <h1>Create project badge</h1>
</header>

<article>
    <form asp-action="Create" oninput="UpdatePreview();">
        <div asp-validation-summary="ModelOnly" class="text-danger"></div>
        <div>
            <label asp-for="Name"></label>
            <input asp-for="Name" type="text" />
            <span asp-validation-for="Name" class="text-danger"></span>
        </div>
        <div>
            <label asp-for="EnglishDescription"></label>
            <input asp-for="EnglishDescription" type="text" />
            <span asp-validation-for="EnglishDescription" class="text-danger"></span>
        </div>
        <div>
            <label asp-for="RussianDescription"></label>
            <input asp-for="RussianDescription" type="text" />
            <span asp-validation-for="RussianDescription" class="text-danger"></span>
        </div>
        <div>
            <label asp-for="Image"></label>
            <div class="image-selector">
                <select asp-for="Image" asp-items="files" onchange="UpdatePreview();"></select>
                <span>.png</span>
            </div>
            <span asp-validation-for="Image" class="text-danger"></span>
        </div>
        <partial name="Preview.cshtml" />

        <input type="submit" value="Create" class="btn" />
    </form>
    <hr />
    <h2>Upload badge image</h2>
    <form method="post" enctype="multipart/form-data">
        <input type="file" accept="image/png" name="file" />
        <label for="file" style="@(ViewData.Keys.Contains("UploadException") ? "color: red" : "")">File must be a 64x64 PNG image</label>
        <input type="submit" value="Upload image" class="btn" />
    </form>
</article>

<link type="text/css" rel="stylesheet" href="~/css/Admin.css" />