Добавил считывание с файла

Store/Controllers/ProductController.cs

-using System;
-using System.Collections.Generic;
+using System.Linq;
 using Microsoft.AspNetCore.Mvc;
 using Store.Models;
 
@@ -7,45 +6,26 @@ namespace Store.Controllers
 {
     public class ProductController : Controller
     {
-        public IActionResult Index()
-        {
-            List<Product> products = new List<Product>
-            {
-                new Product
-                {
-                    Id = Guid.NewGuid().ToString(),
-                    Name = "Asus A234",
-                    Amount = 100,
-                    Brand = "Asus",
-                    Category = "TV"
-                },
-                new Product
-                {
-                    Id = Guid.NewGuid().ToString(),
-                    Name = "Asus A674",
-                    Amount = 150,
-                    Brand = "Asus",
-                    Category = "TV"
-                }
-            };
+        private ProductContext _context;
 
-            ViewBag.products = products;
+        public ProductController(ProductContext context)
+        {
+            _context = context;
+        }
 
-            return View();
+        public IActionResult Index()
+        {
+            return View(_context.Products);
         }
 
         public IActionResult Details(string id)
         {
-            return View(new Product
-            {
-                Id = Guid.NewGuid().ToString(),
-                Name = "Asus A674",
-                Amount = 150,
-                Brand = "Asus",
-                Category = "TV"
-            });
+            Product product = _context.Products.FirstOrDefault(p => p.Id == id);
+            ViewBag.product = product;
+            return View();
         }
 
+        [ActionName("CreateProduct")]
         [HttpGet]
         public IActionResult Create()
         {
@@ -55,7 +35,8 @@ namespace Store.Controllers
         [HttpPost]
         public IActionResult Create(Product product)
         {
-
+            _context.Products.Add(product);
+            _context.SaveChanges();
             return View("Details", product);
         }
     }

Store/Views/Product/Create.cshtml → Store/Views/Product/CreateProduct.cshtml

+@model Store.Models.Product
 @{
     Layout = "_MainLayout";
 }
@@ -8,22 +9,27 @@
 <form action="/Product/Create" method="post" >
   <div class="form-group">
     <label for="">Name</label>
-    <input type="text" class="form-control" id="Name" name="Name" placeholder="Enter name">
+    <input type="text" class="form-control" value="@Model.Name" id="Name" name="Name"  placeholder="Enter name">
   </div>
 
   <div class="form-group">
     <label for="">Category</label>
-    <input type="text" class="form-control" id="Category" name="Category" placeholder="Enter category">
+    <input type="text" class="form-control" value="@Model.Category" id="Category" name="Category" placeholder="Enter category">
   </div>
 
   <div class="form-group">
     <label for="">Brand</label>
-    <input type="text" class="form-control" id="Brand" name="Brand" placeholder="Enter brand">
+    <input type="text" class="form-control" value="@Model.Brand" id="Brand" name="Brand" placeholder="Enter brand">
   </div>
 
   <div class="form-group">
     <label for="">Amount</label>
-    <input type="text" class="form-control" id="Amount" name="Amount" placeholder="Enter amount">
+    <input type="text" class="form-control" value="@Model.Amount" id="Amount" name="Amount" placeholder="Enter amount">
+  </div>
+
+  <div class="form-group">
+    <label for="">Description</label>
+    <input type="text" class="form-control" value="@Model.Description" id="Description" name="Description" placeholder="Enter amount">
   </div>
 
   <button type="submit" class="btn btn-primary">Create</button>

Store/Views/Product/Details.cshtml

-@model Store.Models.Product
-
 @{
     Layout = "_MainLayout";
 }
@@ -9,19 +7,19 @@
     <tbody>
     <tr>
         <td>Name:</td>
-        <td>@Model.Name</td>
+        <td>@ViewBag.product.Name</td>
     </tr>
     <tr>
         <td>Category:</td>
-        <td>@Model.Category</td>
+        <td>@ViewBag.product.Category</td>
     </tr>
     <tr>
         <td>Brand:</td>
-        <td>@Model.Brand</td>
+        <td>@ViewBag.product.Brand</td>
     </tr>
     <tr>
         <td>Amount:</td>
-        <td>@Model.Amount</td>
+        <td>@ViewBag.product.Amount</td>
     </tr>
     </tbody>
 </table>

Store/Views/Product/Index.cshtml

 @using Store.Models
-
+@model IEnumerable<Store.Models.Product>
 @{
     Layout = "_MainLayout";
 }
@@ -19,7 +19,7 @@
     </tr>
     </thead>
     <tbody>
-        @foreach (Product product in ViewBag.products)
+        @foreach (Product product in Model)
         {
             <tr>
                 <th scope="row">@product.Id</th>