Add project files.

DiaryApp/Views/DiaryEntries/Create.cshtml

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+@model DiaryEntry
+
+<div class="container mt-4">
+    <div class="row">
+        <div class="col-md-8 offset-md-2">
+            <div class="card">
+                <div class="card-header bg-primary text-white">
+                    <h2>Create Diary Entry</h2>
+                </div>
+                <div class="card-body">
+                    <form asp-action="Create" method="post">
+                        <div asp-validation-summary="All" class="text-danger"></div>
+                        <div class="form-group mb-3">
+                            <label asp-for="Title" class="form-label">Title</label>
+                            <input asp-for="Title" class="form-control" placeholder="Enter a Title" />
+                            <span asp-validation-for="Title" class="text-danger"></span>
+                        </div>
+                        <div class="form-group mb-3">
+                            <label asp-for="Content" class="form-label">Content</label>
+                            <input asp-for="Content" row="5" class="form-control" placeholder="Enter what you did that day" />
+                            <span asp-validation-for="Content" class="text-danger"></span>
+                        </div>
+                        <div class="form-group mb-3">
+                            <label asp-for="DateCreated" class="form-label">Date</label>
+                            <input asp-for="DateCreated" row="5" class="form-control" type="date" />
+                            <span asp-validation-for="DateCreated" class="text-danger"></span>
+                        </div>
+                        <div class="d-flex justify-content-between">
+                            <button type="submit" class="btn btn-primary">Create</button>
+                            <a asp-controller="DiaryEntries" asp-action="Index" class="btn btn-secondary">Cancel</a>
+                        </div>
+                    </form>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+
+@section Scripts {
+    <partial name="_ValidationScriptsPartial" />
+}

DiaryApp/Views/DiaryEntries/Delete.cshtml

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+@model DiaryEntry
+
+<div class="container mt-4">
+    <div class="row">
+        <div class="col-md-8 offset-md-2">
+            <div class="card">
+                <div class="card-header bg-primary text-white">
+                    <h2>Delete Diary Entry</h2>
+                </div>
+                <div class="card-body">
+                    <form asp-action="Delete" method="post">
+                        <div asp-validation-summary="All" class="text-danger"></div>
+                        <div class="form-group mb-3">
+                            <label asp-for="Title" class="form-label">Title</label>
+                            <input asp-for="Title" class="form-control" placeholder="Enter a Title" />
+                            <span asp-validation-for="Title" class="text-danger"></span>
+                        </div>
+                        <div class="form-group mb-3">
+                            <label asp-for="Content" class="form-label">Content</label>
+                            <input asp-for="Content" row="5" class="form-control" placeholder="Enter what you did that day" />
+                            <span asp-validation-for="Content" class="text-danger"></span>
+                        </div>
+                        <div class="form-group mb-3">
+                            <label asp-for="DateCreated" class="form-label">Date</label>
+                            <input asp-for="DateCreated" row="5" class="form-control" type="date" />
+                            <span asp-validation-for="DateCreated" class="text-danger"></span>
+                        </div>
+                        <div class="d-flex justify-content-between">
+                            <button type="submit" class="btn btn-danger">Delete</button>
+                            <a asp-controller="DiaryEntries" asp-action="Index" class="btn btn-secondary">Cancel</a>
+                        </div>
+                    </form>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+
+@section Scripts {
+    <partial name="_ValidationScriptsPartial" />
+}
+
+

DiaryApp/Views/DiaryEntries/Edit.cshtml

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+@model DiaryEntry
+
+<div class="container mt-4">
+    <div class="row">
+        <div class="col-md-8 offset-md-2">
+            <div class="card">
+                <div class="card-header bg-primary text-white">
+                    <h2>Edit Diary Entry</h2>
+                </div>
+                <div class="card-body">
+                    <form asp-action="Edit" method="post">
+                        <div asp-validation-summary="All" class="text-danger"></div>
+                        <div class="form-group mb-3">
+                            <label asp-for="Title" class="form-label">Title</label>
+                            <input asp-for="Title" class="form-control" placeholder="Enter a Title" />
+                            <span asp-validation-for="Title" class="text-danger"></span>
+                        </div>
+                        <div class="form-group mb-3">
+                            <label asp-for="Content" class="form-label">Content</label>
+                            <input asp-for="Content" row="5" class="form-control" placeholder="Enter what you did that day" />
+                            <span asp-validation-for="Content" class="text-danger"></span>
+                        </div>
+                        <div class="form-group mb-3">
+                            <label asp-for="DateCreated" class="form-label">Date</label>
+                            <input asp-for="DateCreated" row="5" class="form-control" type="date" />
+                            <span asp-validation-for="DateCreated" class="text-danger"></span>
+                        </div>
+                        <div class="d-flex justify-content-between">
+                            <button type="submit" class="btn btn-primary">Edit</button>
+                            <a asp-controller="DiaryEntries" asp-action="Index" class="btn btn-secondary">Cancel</a>
+                        </div>
+                    </form>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+
+@section Scripts {
+    <partial name="_ValidationScriptsPartial" />
+}
+

DiaryApp/Views/DiaryEntries/Index.cshtml

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+@model List<DiaryEntry>
+
+<div class="container">
+    <div class="row pt-4">
+        <div class="col-6">
+            <a class="btn btn-primary" asp-controller="DiaryEntries" asp-action="Create">
+                <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-journal-plus" viewBox="0 0 16 16">
+                    <path fill-rule="evenodd" d="M8 5.5a.5.5 0 0 1 .5.5v1.5H10a.5.5 0 0 1 0 1H8.5V10a.5.5 0 0 1-1 0V8.5H6a.5.5 0 0 1 0-1h1.5V6a.5.5 0 0 1 .5-.5" />
+                    <path d="M3 0h10a2 2 0 0 1 2 2v12a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2v-1h1v1a1 1 0 0 0 1 1h10a1 1 0 0 0 1-1V2a1 1 0 0 0-1-1H3a1 1 0 0 0-1 1v1H1V2a2 2 0 0 1 2-2" />
+                    <path d="M1 5v-.5a.5.5 0 0 1 1 0V5h.5a.5.5 0 0 1 0 1h-2a.5.5 0 0 1 0-1zm0 3v-.5a.5.5 0 0 1 1 0V8h.5a.5.5 0 0 1 0 1h-2a.5.5 0 0 1 0-1zm0 3v-.5a.5.5 0 0 1 1 0v.5h.5a.5.5 0 0 1 0 1h-2a.5.5 0 0 1 0-1z" />
+                </svg>
+                Create New Diary Entry
+            </a>
+        </div>
+        <div class="col-6 text-end">
+            <h2>
+                Diary Entries
+            </h2>
+        </div>
+    </div>
+</div>
+
+
+<div class="table-responsive">
+    <table class="table table-striped table-hover">
+        <thead>
+            <tr>
+                <th>Title</th>
+                <th>Content</th>
+                <th>EntryDate</th>
+                <th>Actions</th>
+            </tr>
+        </thead>
+        <tbody>
+            @foreach (var entry in Model)
+            {
+                <tr>
+                    <td>@entry.Title</td>
+                    <td>@entry.Content</td>
+                    <td>@entry.DateCreated</td>
+                    <td>
+                        <a asp-controller="DiaryEntries" asp-action="Edit" asp-route-id="@entry.Id" class="btn btn-primary btn-sm">
+                            <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-pencil" viewBox="0 0 16 16">
+                                <path d="M12.146.146a.5.5 0 0 1 .708 0l3 3a.5.5 0 0 1 0 .708l-10 10a.5.5 0 0 1-.168.11l-5 2a.5.5 0 0 1-.65-.65l2-5a.5.5 0 0 1 .11-.168zM11.207 2.5 13.5 4.793 14.793 3.5 12.5 1.207zm1.586 3L10.5 3.207 4 9.707V10h.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.5h.293zm-9.761 5.175-.106.106-1.528 3.821 3.821-1.528.106-.106A.5.5 0 0 1 5 12.5V12h-.5a.5.5 0 0 1-.5-.5V11h-.5a.5.5 0 0 1-.468-.325" />
+                            </svg>
+                            Edit
+                        </a>
+                        <a asp-controller="DiaryEntries" asp-action="Delete" asp-route-id="@entry.Id" class="btn btn-danger btn-sm">
+                            <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-trash" viewBox="0 0 16 16">
+                                <path d="M5.5 5.5A.5.5 0 0 1 6 6v6a.5.5 0 0 1-1 0V6a.5.5 0 0 1 .5-.5m2.5 0a.5.5 0 0 1 .5.5v6a.5.5 0 0 1-1 0V6a.5.5 0 0 1 .5-.5m3 .5a.5.5 0 0 0-1 0v6a.5.5 0 0 0 1 0z" />
+                                <path d="M14.5 3a1 1 0 0 1-1 1H13v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V4h-.5a1 1 0 0 1-1-1V2a1 1 0 0 1 1-1H6a1 1 0 0 1 1-1h2a1 1 0 0 1 1 1h3.5a1 1 0 0 1 1 1zM4.118 4 4 4.059V13a1 1 0 0 0 1 1h6a1 1 0 0 0 1-1V4.059L11.882 4zM2.5 3h11V2h-11z" />
+                            </svg>
+                            Delete
+                        </a>
+                    </td>
+                    @*                 <td>
+                    @Html.ActionLink("Edit", "Edit", new { id=item.Id }) |
+                    @Html.ActionLink("Details", "Details", new { id=item.Id }) |
+                    @Html.ActionLink("Delete", "Delete", new { id=item.Id })
+                </td>
+ *@         </tr>
+            }
+        </tbody>
+    </table>
+</div>

DiaryApp/Views/Home/Index.cshtml

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+@{
+    ViewData["Title"] = "Home Page";
+}
+
+
+<div class="text-center">
+    <h1 class="display-4">Welcome</h1>
+    <p>Learn about <a href="https://learn.microsoft.com/aspnet/core">building Web apps with ASP.NET Core</a>.</p>
+</div>

DiaryApp/Views/Home/MyPage.cshtml

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+@*
+    For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
+*@
+@{
+}
+
+<h1>Welcome to MY PAGE!</h1>

DiaryApp/Views/Home/Privacy.cshtml

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+@{
+    ViewData["Title"] = "Privacy Policy";
+}
+<h1>@ViewData["Title"]</h1>
+
+<p>Use this page to detail your site's privacy policy.</p>

DiaryApp/Views/Shared/Error.cshtml

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+@model ErrorViewModel
+@{
+    ViewData["Title"] = "Error";
+}
+
+<h1 class="text-danger">Error.</h1>
+<h2 class="text-danger">An error occurred while processing your request.</h2>
+
+@if (Model.ShowRequestId)
+{
+    <p>
+        <strong>Request ID:</strong> <code>@Model.RequestId</code>
+    </p>
+}
+
+<h3>Development Mode</h3>
+<p>
+    Swapping to <strong>Development</strong> environment will display more detailed information about the error that occurred.
+</p>
+<p>
+    <strong>The Development environment shouldn't be enabled for deployed applications.</strong>
+    It can result in displaying sensitive information from exceptions to end users.
+    For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
+    and restarting the app.
+</p>

DiaryApp/Views/Shared/_Layout.cshtml

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>@ViewData["Title"] - DiaryApp</title>
+    <script type="importmap"></script>
+    <link rel="stylesheet" href="~/lib/bootstrap/dist/css/bootstrap.css" />
+    <link rel="stylesheet" href="~/css/site.css" asp-append-version="true" />
+    <link rel="stylesheet" href="~/DiaryApp.styles.css" asp-append-version="true" />
+</head>
+<body>
+    <header>
+        <nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-light bg-primary border-bottom box-shadow mb-3">
+            <div class="container-fluid">
+                <a class="navbar-brand text-light" asp-area="" asp-controller="Home" asp-action="Index">
+                    My Diary
+                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-journal-richtext" viewBox="0 0 16 16">
+                        <path d="M7.5 3.75a.75.75 0 1 1-1.5 0 .75.75 0 0 1 1.5 0m-.861 1.542 1.33.886 1.854-1.855a.25.25 0 0 1 .289-.047L11 4.75V7a.5.5 0 0 1-.5.5h-5A.5.5 0 0 1 5 7v-.5s1.54-1.274 1.639-1.208M5 9.5a.5.5 0 0 1 .5-.5h5a.5.5 0 0 1 0 1h-5a.5.5 0 0 1-.5-.5m0 2a.5.5 0 0 1 .5-.5h2a.5.5 0 0 1 0 1h-2a.5.5 0 0 1-.5-.5" />
+                        <path d="M3 0h10a2 2 0 0 1 2 2v12a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2v-1h1v1a1 1 0 0 0 1 1h10a1 1 0 0 0 1-1V2a1 1 0 0 0-1-1H3a1 1 0 0 0-1 1v1H1V2a2 2 0 0 1 2-2" />
+                        <path d="M1 5v-.5a.5.5 0 0 1 1 0V5h.5a.5.5 0 0 1 0 1h-2a.5.5 0 0 1 0-1zm0 3v-.5a.5.5 0 0 1 1 0V8h.5a.5.5 0 0 1 0 1h-2a.5.5 0 0 1 0-1zm0 3v-.5a.5.5 0 0 1 1 0v.5h.5a.5.5 0 0 1 0 1h-2a.5.5 0 0 1 0-1z" />
+                    </svg>
+                    </a>
+                <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target=".navbar-collapse" aria-controls="navbarSupportedContent"
+                        aria-expanded="false" aria-label="Toggle navigation">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
+                <div class="navbar-collapse collapse d-sm-inline-flex justify-content-between">
+                    <ul class="navbar-nav flex-grow-1">
+                        <li class="nav-item">
+                            <a class="nav-link text-light" asp-area="" asp-controller="Home" asp-action="Index">Home</a>
+                        </li>
+                        <li class="nav-item">
+                            <a class="nav-link text-light" asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>
+                        </li>
+                        <li class="nav-item">
+                            <a class="nav-link text-light" asp-area="" asp-controller="DiaryEntries" asp-action="Index">My Diary</a>
+                        </li>
+                    </ul>
+                </div>
+            </div>
+        </nav>
+    </header>
+    <div class="container">
+        <main role="main" class="pb-3">
+            @RenderBody()
+        </main>
+    </div>
+
+    <footer class="border-top footer text-muted">
+        <div class="container">
+            &copy; 2026 - DiaryApp - <a asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>
+        </div>
+    </footer>
+    <script src="~/lib/jquery/dist/jquery.min.js"></script>
+    <script src="~/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>
+    <script src="~/js/site.js" asp-append-version="true"></script>
+    @await RenderSectionAsync("Scripts", required: false)
+</body>
+</html>

DiaryApp/Views/Shared/_Layout.cshtml.css

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+/* Please see documentation at https://learn.microsoft.com/aspnet/core/client-side/bundling-and-minification
+for details on configuring this project to bundle and minify static web assets. */
+
+a.navbar-brand {
+  white-space: normal;
+  text-align: center;
+  word-break: break-all;
+}
+
+a {
+  color: #0077cc;
+}
+
+.btn-primary {
+  color: #fff;
+  background-color: #1b6ec2;
+  border-color: #1861ac;
+}
+
+.nav-pills .nav-link.active, .nav-pills .show > .nav-link {
+  color: #fff;
+  background-color: #1b6ec2;
+  border-color: #1861ac;
+}
+
+.border-top {
+  border-top: 1px solid #e5e5e5;
+}
+.border-bottom {
+  border-bottom: 1px solid #e5e5e5;
+}
+
+.box-shadow {
+  box-shadow: 0 .25rem .75rem rgba(0, 0, 0, .05);
+}
+
+button.accept-policy {
+  font-size: 1rem;
+  line-height: inherit;
+}
+
+.footer {
+  position: absolute;
+  bottom: 0;
+  width: 100%;
+  white-space: nowrap;
+  line-height: 60px;
+}

DiaryApp/Views/Shared/_ValidationScriptsPartial.cshtml

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+<script src="~/lib/jquery-validation/dist/jquery.validate.min.js"></script>
+<script src="~/lib/jquery-validation-unobtrusive/dist/jquery.validate.unobtrusive.min.js"></script>

DiaryApp/Views/_ViewImports.cshtml

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+@using DiaryApp
+@using DiaryApp.Models
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

DiaryApp/Views/_ViewStart.cshtml

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+@{
+    Layout = "_Layout";
+}