Fix markup

OD.WebApplication/Models/HomeViewModel.cs

@@ -1,3 +1,4 @@
+using System.ComponentModel.DataAnnotations;
 using System.IO;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.FileProviders;
@@ -6,6 +7,7 @@ namespace OD.WebApplication.Models
 {
     public class HomeViewModel
     {
+        [Required]
         public IFormFile FileAttach { get; set; }
     }
 }

OD.WebApplication/Views/Home/Index.cshtml

@@ -5,16 +5,12 @@
 }
 
 <div class="text-center">
-    <h4>Escoge el CSV a parsear</h4>
-    <br/>
     @using (Html.BeginForm("UploadCSV", "Home", FormMethod.Post, new {id = "loginForm", enctype = "multipart/form-data"}))
     {
         @Html.AntiForgeryToken()
-        <div class="form-group">
-            <label asp-for="@Model.FileAttach"></label>
-            <input asp-for="@Model.FileAttach" type="file">
-            <span asp-validation-for="@Model.FileAttach"></span>
-        </div>
+        <label asp-for="@Model.FileAttach">Escoge el CSV a convertir</label><br/>
+        <input asp-for="@Model.FileAttach" type="file">
+        <br/>
         <input class="btn btn-outline-primary" type="submit"/>
     }