diff --git a/Webzine.Repository/DbStyleRepository.cs b/Webzine.Repository/DbStyleRepository.cs
index 8cb5120..d831ead 100644
--- a/Webzine.Repository/DbStyleRepository.cs
+++ b/Webzine.Repository/DbStyleRepository.cs
@@ -94,7 +94,6 @@ public class DbStyleRepository : IStyleRepository
             this.logger.LogDebug("Recherche du style avec l'ID: {Id}", id);
 
             var style = this.context.Styles
-                .AsNoTracking()
                 .Include(s => s.Titres)
                 .SingleOrDefault(s => s.IdStyle == id);
 
@@ -123,7 +122,6 @@ public class DbStyleRepository : IStyleRepository
             this.logger.LogDebug("Tri des styles par libellé");
 
             var styles = this.context.Styles
-                .AsNoTracking()
                 .OrderBy(s => s.Libelle);
 
             this.logger.LogDebug("La liste de styles a été récupérée.");
diff --git a/Webzine.WebApplication/Areas/Administration/Controllers/ArtisteController.cs b/Webzine.WebApplication/Areas/Administration/Controllers/ArtisteController.cs
index ff1fa43..c5df960 100644
--- a/Webzine.WebApplication/Areas/Administration/Controllers/ArtisteController.cs
+++ b/Webzine.WebApplication/Areas/Administration/Controllers/ArtisteController.cs
@@ -113,12 +113,15 @@ public class ArtisteController : Controller
     [HttpPost]
     public IActionResult Edit(ArtisteEditViewModel model)
     {
-        var artiste = new Artiste
+        var artiste = this.artisteRepository.Find(model.Id);
+
+        if (artiste == null)
         {
-            IdArtiste = model.Id,
-            Nom = model.Nom,
-            Biographie = model.Biographie,
-        };
+            return this.RedirectToAction("Index");
+        }
+
+        artiste.Nom = model.Nom;
+        artiste.Biographie = model.Biographie;
 
         this.artisteRepository.Update(artiste);
 
diff --git a/Webzine.WebApplication/Areas/Administration/Controllers/StyleController.cs b/Webzine.WebApplication/Areas/Administration/Controllers/StyleController.cs
index 5fc6067..51b9d80 100644
--- a/Webzine.WebApplication/Areas/Administration/Controllers/StyleController.cs
+++ b/Webzine.WebApplication/Areas/Administration/Controllers/StyleController.cs
@@ -2,9 +2,10 @@ namespace Webzine.WebApplication.Areas.Administration.Controllers;
 
 using Microsoft.AspNetCore.Mvc;
 
+using ViewModels.Styles;
+
 using Webzine.Entity;
 using Webzine.Repository.Contracts;
-using Webzine.WebApplication.Areas.Administration.ViewModels.Style;
 
 /// <summary>
 /// Controleur pour la gestion des styles dans l'administration du webzine.
diff --git a/Webzine.WebApplication/Areas/Administration/Controllers/TitreController.cs b/Webzine.WebApplication/Areas/Administration/Controllers/TitreController.cs
index f4557d6..a42bdb4 100644
--- a/Webzine.WebApplication/Areas/Administration/Controllers/TitreController.cs
+++ b/Webzine.WebApplication/Areas/Administration/Controllers/TitreController.cs
@@ -114,6 +114,33 @@ public class TitreController : Controller
     [HttpPost]
     public IActionResult Create(TitreAdminDTO model)
     {
+        if (!this.ModelState.IsValid)
+        {
+            var form = new AdminTitreForm
+            {
+                IdArtiste = model.IdArtiste,
+                Libelle = model.Libelle,
+                Album = model.Album,
+                Chronique = model.Chronique,
+                DateSortie = model.DateSortie,
+                Duree = model.Duree,
+                UrlJaquette = model.UrlJaquette,
+                UrlEcoute = model.UrlEcoute,
+                Styles = model.Styles,
+                Artistes = this.artisteRepository.FindAll().Select(a => new SelectListItem
+                {
+                    Value = a.IdArtiste.ToString(),
+                    Text = a.Nom,
+                }).ToList(),
+                AllStyles = this.styleRepository.FindAll().Select(s => new SelectListItem
+                {
+                    Value = s.IdStyle.ToString(),
+                    Text = s.Libelle,
+                }).ToList(),
+            };
+            return this.View(form);
+        }
+
         this.titreAdminService.CreerTitre(model);
         return this.RedirectToAction("Index");
     }
@@ -166,6 +193,34 @@ public class TitreController : Controller
     [HttpPost]
     public IActionResult Edit(TitreAdminDTO model)
     {
+        if (!this.ModelState.IsValid)
+        {
+            var form = new AdminTitreForm
+            {
+                Id = model.Id,
+                IdArtiste = model.IdArtiste,
+                Libelle = model.Libelle,
+                Album = model.Album,
+                Chronique = model.Chronique,
+                DateSortie = model.DateSortie,
+                Duree = model.Duree,
+                UrlJaquette = model.UrlJaquette,
+                UrlEcoute = model.UrlEcoute,
+                Styles = model.Styles,
+                Artistes = this.artisteRepository.FindAll().Select(a => new SelectListItem
+                {
+                    Value = a.IdArtiste.ToString(),
+                    Text = a.Nom,
+                }).ToList(),
+                AllStyles = this.styleRepository.FindAll().Select(s => new SelectListItem
+                {
+                    Value = s.IdStyle.ToString(),
+                    Text = s.Libelle,
+                }).ToList(),
+            };
+            return this.View(form);
+        }
+
         this.titreAdminService.ModifierTitre(model);
         return this.RedirectToAction("Index");
     }
diff --git a/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/AdminArtisteForm.cs b/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/AdminArtisteForm.cs
index c1700cb..ee14731 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/AdminArtisteForm.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/AdminArtisteForm.cs
@@ -14,11 +14,11 @@
         /// <summary>
         /// Définit le nom de l'artiste.
         /// </summary>
-        public string Nom { get; set; }
+        public string? Nom { get; set; }
 
         /// <summary>
         /// Définit la biographie de l'artiste.
         /// </summary>
-        public string Biographie { get; set; }
+        public string? Biographie { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteCreateViewModel.cs b/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteCreateViewModel.cs
index bdb43de..68dedd6 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteCreateViewModel.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteCreateViewModel.cs
@@ -10,12 +10,15 @@
         /// <summary>
         /// Nom de l'artiste.
         /// </summary>
-        [Required]
+        [Required(ErrorMessage = "Le nom de l'auteur est obligatoire.")]
+        [StringLength(50, ErrorMessage = "Le nom ne doit pas dépasser 50 caractères.")]
         public string Nom { get; set; }
 
         /// <summary>
         /// Biographie de l'artiste.
-        /// </summary>
+        /// </summary>*
+        [Required(ErrorMessage = "La biographie ne peux pas etre vide.")]
+
         public string Biographie { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteEditViewModel.cs b/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteEditViewModel.cs
index bf2d503..7d40252 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteEditViewModel.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteEditViewModel.cs
@@ -16,12 +16,11 @@
         /// <summary>
         /// Nom de l'artiste.
         /// </summary>
-        [Required]
+        [Required(ErrorMessage = "Le nom de l'auteur est obligatoire.")]
+        [StringLength(50, ErrorMessage = "Le nom ne doit pas dépasser 50 caractères.")]
+
         public string Nom { get; set; }
 
-        /// <summary>
-        /// Biographie de l'artiste.
-        /// </summary>
         public string Biographie { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleCreateViewModel.cs b/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleCreateViewModel.cs
index 86abbde..de912e7 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleCreateViewModel.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleCreateViewModel.cs
@@ -2,7 +2,7 @@
 // Copyright (c) Equipe 1 - BOBIN, MASI, NODON, VETU. All rights reserved.
 // </copyright>
 
-namespace Webzine.WebApplication.Areas.Administration.ViewModels.Style
+namespace Webzine.WebApplication.Areas.Administration.ViewModels.Styles
 {
     using System.ComponentModel.DataAnnotations;
 
@@ -14,7 +14,7 @@ namespace Webzine.WebApplication.Areas.Administration.ViewModels.Style
         /// <summary>
         /// Obtient ou définit le libellé du style.
         /// </summary>
-        [Required]
+        [Required(ErrorMessage = "Le libelle du style est obligatoire.")]
         public string Libelle { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleDeleteViewModel.cs b/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleDeleteViewModel.cs
index fc94e54..daade0d 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleDeleteViewModel.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleDeleteViewModel.cs
@@ -2,7 +2,7 @@
 // Copyright (c) Equipe 1 - BOBIN, MASI, NODON, VETU. All rights reserved.
 // </copyright>
 
-namespace Webzine.WebApplication.Areas.Administration.ViewModels.Style
+namespace Webzine.WebApplication.Areas.Administration.ViewModels.Styles
 {
     /// <summary>
     /// ViewModel pour la suppression d'un style en administration.
@@ -17,6 +17,6 @@ namespace Webzine.WebApplication.Areas.Administration.ViewModels.Style
         /// <summary>
         /// Obtient ou définit le libellé du style.
         /// </summary>
-        public string Libelle { get; set; }
+        public string? Libelle { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleEditViewModel.cs b/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleEditViewModel.cs
index 093c130..b959456 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleEditViewModel.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleEditViewModel.cs
@@ -2,7 +2,7 @@
 // Copyright (c) Equipe 1 - BOBIN, MASI, NODON, VETU. All rights reserved.
 // </copyright>
 
-namespace Webzine.WebApplication.Areas.Administration.ViewModels.Style
+namespace Webzine.WebApplication.Areas.Administration.ViewModels.Styles
 {
     using System.ComponentModel.DataAnnotations;
 
@@ -19,7 +19,7 @@ namespace Webzine.WebApplication.Areas.Administration.ViewModels.Style
         /// <summary>
         /// Obtient ou definit le libelle du style.
         /// </summary>
-        [Required]
+        [Required(ErrorMessage = "Le libelle du style est obligatoire.")]
         public string Libelle { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Webzine.WebApplication/Areas/Administration/ViewModels/Titre/AdminTitreForm.cs b/Webzine.WebApplication/Areas/Administration/ViewModels/Titre/AdminTitreForm.cs
index 5305732..22c5fd9 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Titre/AdminTitreForm.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Titre/AdminTitreForm.cs
@@ -1,5 +1,7 @@
 namespace Webzine.WebApplication.Areas.Administration.ViewModels.Titre;
 
+using System.ComponentModel.DataAnnotations;
+
 using Microsoft.AspNetCore.Mvc.Rendering;
 
 /// <summary>
@@ -15,36 +17,47 @@ public class AdminTitreForm
     /// <summary>
     /// Définit l'identifiant de l'artiste associé au titre.
     /// </summary>
+    [Required(ErrorMessage = "L'id de l'artiste est obligatoire.")]
+
     public int IdArtiste { get; set; }
 
     /// <summary>
     /// Définit le titre du titre.
     /// </summary>
+    [Required(ErrorMessage = "Le labelle est obligatoire.")]
+
     public string Libelle { get; set; }
 
     /// <summary>
     /// Définit le nom de l'album associé au titre.
     /// </summary>
+    [Required(ErrorMessage = "L'album est obligatoire.")]
+
     public string Album { get; set; }
 
     /// <summary>
     /// Définit la chronique du titre, peut-être une critique ou une description du titre.
     /// </summary>
+    [Required(ErrorMessage = "La chronique est obligatoire.")]
     public string Chronique { get; set; }
 
     /// <summary>
     /// Définit la date de sortie du titre.
     /// </summary>
+    [Required(ErrorMessage = "La date de  est obligatoire.")]
+
     public DateTime DateSortie { get; set; }
 
     /// <summary>
     /// Définit la durée du titre en secondes.
     /// </summary>
+    [Required(ErrorMessage = "La durée est obligatoire.")]
     public int Duree { get; set; }
 
     /// <summary>
     /// Définit l'URL de la jaquette de l'album associé au titre.
     /// </summary>
+    [Required(ErrorMessage = "L'Url de la jaquette est obligatoire.")]
     public string UrlJaquette { get; set; }
 
     /// <summary>
diff --git a/Webzine.WebApplication/Areas/Administration/Views/Artiste/Create.cshtml b/Webzine.WebApplication/Areas/Administration/Views/Artiste/Create.cshtml
index 38f842b..b9dc4ca 100644
--- a/Webzine.WebApplication/Areas/Administration/Views/Artiste/Create.cshtml
+++ b/Webzine.WebApplication/Areas/Administration/Views/Artiste/Create.cshtml
@@ -11,6 +11,8 @@
             <label class="col-md-3 col-form-label">Nom de l'artiste<span class="text-danger">*</span></label>
             <div class="col-md-9">
                 <input asp-for="Nom" class="form-control" />
+                <span asp-validation-for="Nom" class="text-danger"></span>
+
             </div>
         </div>
 
@@ -19,6 +21,8 @@
             <label class="col-md-3 col-form-label">Biographie</label>
             <div class="col-md-9">
                 <textarea asp-for="Biographie" class="form-control" rows="5"></textarea>
+                <span asp-validation-for="Biographie" class="text-danger"></span>
+
             </div>
         </div>
 
diff --git a/Webzine.WebApplication/Areas/Administration/Views/Artiste/_Form.cshtml b/Webzine.WebApplication/Areas/Administration/Views/Artiste/_Form.cshtml
index 960ad3f..c7fbf2e 100644
--- a/Webzine.WebApplication/Areas/Administration/Views/Artiste/_Form.cshtml
+++ b/Webzine.WebApplication/Areas/Administration/Views/Artiste/_Form.cshtml
@@ -6,6 +6,8 @@
         <label class="col-md-3 col-form-label">Nom de l'artiste<span class="text-danger">*</span></label>
         <div class="col-md-9">
             <input asp-for="Nom" class="form-control" />
+            <span asp-validation-for="Nom" class="text-danger"></span>
+
         </div>
     </div>
 
@@ -14,7 +16,10 @@
         <label class="col-md-3 col-form-label">Biographie</label>
         <div class="col-md-9">
             <textarea asp-for="Biographie" class="form-control" rows="5"></textarea>
+            <span asp-validation-for="Biographie" class="text-danger"></span>
+
         </div>
+
     </div>
 
     <!-- BOUTONS -->
diff --git a/Webzine.WebApplication/Areas/Administration/Views/Style/Create.cshtml b/Webzine.WebApplication/Areas/Administration/Views/Style/Create.cshtml
index c0cb8f7..ddc0c14 100644
--- a/Webzine.WebApplication/Areas/Administration/Views/Style/Create.cshtml
+++ b/Webzine.WebApplication/Areas/Administration/Views/Style/Create.cshtml
@@ -1,4 +1,4 @@
-@model Webzine.WebApplication.Areas.Administration.ViewModels.Style.StyleCreateViewModel
+@model Webzine.WebApplication.Areas.Administration.ViewModels.Styles.StyleCreateViewModel
 
 @{
     ViewData["Title"] = "Créer un style";
diff --git a/Webzine.WebApplication/Areas/Administration/Views/Style/Delete.cshtml b/Webzine.WebApplication/Areas/Administration/Views/Style/Delete.cshtml
index 47dad12..61dce02 100644
--- a/Webzine.WebApplication/Areas/Administration/Views/Style/Delete.cshtml
+++ b/Webzine.WebApplication/Areas/Administration/Views/Style/Delete.cshtml
@@ -1,4 +1,4 @@
-@model Webzine.WebApplication.Areas.Administration.ViewModels.Style.StyleDeleteViewModel
+@model Webzine.WebApplication.Areas.Administration.ViewModels.Styles.StyleDeleteViewModel
 
 @{
     ViewData["Title"] = "Supprimer un style";
diff --git a/Webzine.WebApplication/Areas/Administration/Views/Style/Edit.cshtml b/Webzine.WebApplication/Areas/Administration/Views/Style/Edit.cshtml
index 446cabe..bf57f66 100644
--- a/Webzine.WebApplication/Areas/Administration/Views/Style/Edit.cshtml
+++ b/Webzine.WebApplication/Areas/Administration/Views/Style/Edit.cshtml
@@ -1,4 +1,4 @@
-@model Webzine.WebApplication.Areas.Administration.ViewModels.Style.StyleEditViewModel
+@model Webzine.WebApplication.Areas.Administration.ViewModels.Styles.StyleEditViewModel
 
 @{
     ViewData["Title"] = "Editer un style";
diff --git a/Webzine.WebApplication/Areas/Administration/Views/Titre/_Form.cshtml b/Webzine.WebApplication/Areas/Administration/Views/Titre/_Form.cshtml
index d1f4f8c..bc44d5a 100644
--- a/Webzine.WebApplication/Areas/Administration/Views/Titre/_Form.cshtml
+++ b/Webzine.WebApplication/Areas/Administration/Views/Titre/_Form.cshtml
@@ -8,6 +8,8 @@
             <select asp-for="IdArtiste"
                     asp-items="Model.Artistes"
                     class="form-select"></select>
+            <span asp-validation-for="IdArtiste" class="text-danger"></span>
+
         </div>
     </div>
 
@@ -16,6 +18,7 @@
         <label class="col-md-3 col-form-label">Titre<span class="text-danger">*</span></label>
         <div class="col-md-9">
             <input asp-for="Libelle" class="form-control"/>
+            <span asp-validation-for="Libelle" class="text-danger"></span>
         </div>
     </div>
 
@@ -24,6 +27,7 @@
         <label class="col-md-3 col-form-label">Album<span class="text-danger">*</span></label>
         <div class="col-md-9">
             <input asp-for="Album" class="form-control"/>
+            <span asp-validation-for="Album" class="text-danger"></span>
         </div>
     </div>
 
@@ -34,6 +38,8 @@
             <textarea asp-for="Chronique"
                       class="form-control"
                       rows="5"></textarea>
+            <span asp-validation-for="Chronique" class="text-danger"></span>
+
         </div>
     </div>
 
@@ -55,6 +61,8 @@
                        class="form-control"
                        type="number"
                        min="0" />
+                <span asp-validation-for="Duree" class="text-danger"></span>
+
                 <span class="input-group-text text-muted">seconds</span>
             </div>
         </div>
@@ -66,6 +74,8 @@
         <div class="col-md-9">
             <input asp-for="UrlJaquette"
                    class="form-control"/>
+            <span asp-validation-for="UrlJaquette" class="text-danger"></span>
+
         </div>
     </div>
 
diff --git a/Webzine.WebApplication/Program.cs b/Webzine.WebApplication/Program.cs
index 4340186..4ef5711 100644
--- a/Webzine.WebApplication/Program.cs
+++ b/Webzine.WebApplication/Program.cs
@@ -31,6 +31,7 @@ try
     // controllers avec des vues.
     builder.Services.AddControllersWithViews(options =>
         {
+            // options.Filters.Add<GlobalExceptionFilter>();
             options.Filters.Add<ValidationActionFilter>();
             options.Filters.Add<GlobalExceptionFilter>();
         });
@@ -55,7 +56,7 @@ try
     });
     builder.Services.AddSingleton<EfSlowQueryInterceptor>();
 
-    // En fonction de la configuration, utilise soit les repositories basés sur une base de données, soit les repositories basés sur des listes locales.
+    // En fonction de la configuration, utilise soit les repositories basés sur une base de données, soit les repositories basés sur des listes locales.
     // En fonction de la configuration, utilise soit les repositories bases sur une base de donnees, soit les repositories bases sur des listes locales.
     var repositoryType = builder.Configuration.GetValue<RepositoryType>("Repository");
     var seederType = builder.Configuration.GetValue<SeederType>("Seeder");
diff --git a/Webzine.WebApplication/appsettings.json b/Webzine.WebApplication/appsettings.json
index 70bc2e7..cc61318 100644
--- a/Webzine.WebApplication/appsettings.json
+++ b/Webzine.WebApplication/appsettings.json
@@ -26,6 +26,6 @@
   },
   "AllowedHosts": "*",
   "EfPerformance": {
-    "SeuilMs": 10
+    "SeuilMs": 60
   }
 }
\ No newline at end of file