diff --git a/Webzine.Business/TitreAdminService.cs b/Webzine.Business/TitreAdminService.cs
index 111ad69..e23af11 100644
--- a/Webzine.Business/TitreAdminService.cs
+++ b/Webzine.Business/TitreAdminService.cs
@@ -2,8 +2,8 @@ namespace Webzine.Business;
 
 using Microsoft.Extensions.Logging;
 
-using Webzine.Business.Contracts.Dto;
 using Webzine.Business.Contracts;
+using Webzine.Business.Contracts.Dto;
 using Webzine.Entity;
 using Webzine.Repository.Contracts;
 
diff --git a/Webzine.WebApplication/Areas/Administration/Controllers/TitreController.cs b/Webzine.WebApplication/Areas/Administration/Controllers/TitreController.cs
index e3f7bf2..3f33a2d 100644
--- a/Webzine.WebApplication/Areas/Administration/Controllers/TitreController.cs
+++ b/Webzine.WebApplication/Areas/Administration/Controllers/TitreController.cs
@@ -5,9 +5,9 @@ using Business.Contracts;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Rendering;
 
+using Webzine.Business.Contracts.Dto;
 using Webzine.Entity;
 using Webzine.Repository.Contracts;
-using Webzine.Business.Contracts.Dto;
 using Webzine.WebApplication.Areas.Administration.ViewModels.Titre;
 
 /// <summary>
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..0d34c6f 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteEditViewModel.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Artiste/ArtisteEditViewModel.cs
@@ -16,12 +16,15 @@
         /// <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>
+        [Required(ErrorMessage = "Le contenu de la biographie ne peut pas être vide.")]
         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..2eba907 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleCreateViewModel.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleCreateViewModel.cs
@@ -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/StyleEditViewModel.cs b/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleEditViewModel.cs
index 093c130..671098c 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleEditViewModel.cs
+++ b/Webzine.WebApplication/Areas/Administration/ViewModels/Styles/StyleEditViewModel.cs
@@ -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/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/Configuration/Middlewares.cs b/Webzine.WebApplication/Configuration/Middlewares.cs
index bbfe61e..3a0e533 100644
--- a/Webzine.WebApplication/Configuration/Middlewares.cs
+++ b/Webzine.WebApplication/Configuration/Middlewares.cs
@@ -10,4 +10,4 @@ public class EfPerformanceOptions
     /// Valeur par défaut : 200 ms.
     /// </summary>
     public int SeuilMs { get; set; } = 200;
-}
+}
\ No newline at end of file
diff --git a/Webzine.WebApplication/Program.cs b/Webzine.WebApplication/Program.cs
index 6ad2b22..32c3737 100644
--- a/Webzine.WebApplication/Program.cs
+++ b/Webzine.WebApplication/Program.cs
@@ -33,6 +33,7 @@ try
             options.Filters.Add<ValidationActionFilter>();
             options.Filters.Add<GlobalExceptionFilter>();
         })
+
         // Ajoute la compilation des vues lors de l'execution de l'application.
         // Cela nous evite de recompiler l'application a chaque modification de vue.
         // Necessite le package Nuget Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation.