diff --git a/API_SQLuedo/API/Program.cs b/API_SQLuedo/API/Program.cs
index 286d6a2..a2ef3df 100644
--- a/API_SQLuedo/API/Program.cs
+++ b/API_SQLuedo/API/Program.cs
@@ -19,8 +19,8 @@ builder.Services.AddControllers();
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
 
-builder.Services.AddScoped<IUserService<UserEntity>, DbDataManager.Service.UserDataService>();
-builder.Services.AddScoped<IUserService<UserDTO>, Shared.UserDataService>();
+builder.Services.AddScoped<IUserService<UserEntity>, UserDataService>();
+builder.Services.AddScoped<IUserService<UserDTO>, UserDataServiceApi>();
 
 builder.Services.AddScoped<IInquiryService<InquiryEntity>, InquiryDataService>();
 builder.Services.AddScoped<IInquiryService<InquiryDTO>, InquiryDataServiceApi>();
diff --git a/API_SQLuedo/API/Service/UserDataServiceAPI.cs b/API_SQLuedo/API/Service/UserDataServiceAPI.cs
index c1d4997..482a679 100644
--- a/API_SQLuedo/API/Service/UserDataServiceAPI.cs
+++ b/API_SQLuedo/API/Service/UserDataServiceAPI.cs
@@ -1,26 +1,28 @@
-using Entities;
+using Dto;
+using Entities;
 using Model.OrderCriteria;
 using Shared;
+using Shared.Mapper;
 
 namespace API.Service;
 
-public class UserDataServiceApi(IUserService<UserEntity> userService) : IUserService<UserEntity>
+public class UserDataServiceApi(IUserService<UserEntity> userService) : IUserService<UserDTO>
 {
-    public IEnumerable<UserEntity> GetUsers(int page, int number, UserOrderCriteria orderCriteria)
+    public IEnumerable<UserDTO> GetUsers(int page, int number, UserOrderCriteria orderCriteria)
     {
         var usersEntities = userService.GetUsers(page, number, orderCriteria);
-        return usersEntities.Select(e => e).ToList();
+        return usersEntities.Select(e => e.FromEntityToDTO()).ToList();
     }
 
-    public UserEntity GetUserById(int id) => userService.GetUserById(id);
+    public UserDTO GetUserById(int id) => userService.GetUserById(id).FromEntityToDTO();
 
-    public UserEntity GetUserByUsername(string username) => userService.GetUserByUsername(username);
+    public UserDTO GetUserByUsername(string username) => userService.GetUserByUsername(username).FromEntityToDTO();
 
     public bool DeleteUser(int id) => userService.DeleteUser(id);
 
-    public UserEntity UpdateUser(int id, UserEntity user) =>
-        userService.UpdateUser(id, user);
+    public UserDTO UpdateUser(int id, UserDTO user) =>
+        userService.UpdateUser(id, user.FromDTOToEntity()).FromEntityToDTO();
 
-    public UserEntity CreateUser(string username, string password, string email, bool isAdmin) =>
-        userService.CreateUser(username, password, email, isAdmin);
+    public UserDTO CreateUser(string username, string password, string email, bool isAdmin) =>
+        userService.CreateUser(username, password, email, isAdmin).FromEntityToDTO();
 }
\ No newline at end of file
diff --git a/API_SQLuedo/DbDataManager/Service/UserDataService.cs b/API_SQLuedo/DbDataManager/Service/UserDataService.cs
index b4de650..b3c30dd 100644
--- a/API_SQLuedo/DbDataManager/Service/UserDataService.cs
+++ b/API_SQLuedo/DbDataManager/Service/UserDataService.cs
@@ -1,6 +1,5 @@
 using DbContextLib;
 using Entities;
-using Microsoft.EntityFrameworkCore;
 using Model.OrderCriteria;
 using Shared;
 
@@ -8,7 +7,6 @@ namespace DbDataManager.Service;
 
 public class UserDataService : IUserService<UserEntity>
 {
-
     private UserDbContext DbContext { get; set; }
 
     public UserDataService(UserDbContext context)
@@ -41,8 +39,29 @@ public class UserDataService : IUserService<UserEntity>
 
     public IEnumerable<UserEntity> GetUsers(int page, int number, UserOrderCriteria orderCriteria)
     {
-        return DbContext.Users.Skip((page - 1) * number).Take(number).ToList()
-            .Select(u => u);
+        IQueryable<UserEntity> query = DbContext.Users.Skip((page - 1) * number).Take(number);
+        switch (orderCriteria)
+        {
+            case UserOrderCriteria.None:
+                break;
+            case UserOrderCriteria.ById:
+                query = query.OrderBy(s => s.Id);
+                break;
+            case UserOrderCriteria.ByUsername:
+                query = query.OrderBy(s => s.Username);
+                break;
+            case UserOrderCriteria.ByEmail:
+                query = query.OrderBy(s => s.Email);
+                break;
+            case UserOrderCriteria.ByIsAdmin:
+                query = query.OrderBy(s => s.IsAdmin);
+                break;
+            default:
+                break;
+        }
+
+        var users = query.ToList();
+        return users;
     }
 
     public bool DeleteUser(int id)
@@ -70,15 +89,13 @@ public class UserDataService : IUserService<UserEntity>
         updatingUser.Password = user.Password;
         updatingUser.Email = user.Email;
         updatingUser.IsAdmin = user.IsAdmin;
-        // Permet d'indiquer en Db que l'entité a été modifiée.
-        DbContext.Entry(updatingUser).State = EntityState.Modified;
         DbContext.SaveChangesAsync();
         return updatingUser;
     }
 
     public UserEntity CreateUser(string username, string password, string email, bool isAdmin)
     {
-        var newUserEntity = new UserEntity()
+        var newUserEntity = new UserEntity
         {
             Username = username,
             Password = password,
diff --git a/API_SQLuedo/Shared/UserDataService.cs b/API_SQLuedo/Shared/UserDataService.cs
deleted file mode 100644
index a90b809..0000000
--- a/API_SQLuedo/Shared/UserDataService.cs
+++ /dev/null
@@ -1,121 +0,0 @@
-using Dto;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using Microsoft.EntityFrameworkCore;
-using Entities;
-using Shared.Mapper;
-using DbContextLib;
-using Model.OrderCriteria;
-
-namespace Shared
-{
-    public class UserDataService : IUserDataService
-    {
-        private UserDbContext DbContext { get; set; }
-
-        public UserDataService(UserDbContext context)
-        {
-            DbContext = context;
-            context.Database.EnsureCreated();
-        }
-
-        public UserDTO GetUserById(int id)
-        {
-            var userEntity = DbContext.Users.FirstOrDefault(u => u.Id == id);
-            if (userEntity == null)
-            {
-                throw new ArgumentException("Impossible de trouver l'utilisateur", nameof(id));
-            }
-
-            return userEntity.FromEntityToDTO();
-
-        }
-
-        public UserDTO GetUserByUsername(string username)
-        {
-            var userEntity = DbContext.Users.FirstOrDefault(u => u.Username == username);
-            if (userEntity == null)
-            {
-                throw new ArgumentException("Impossible de trouver l'utilisateur", nameof(username));
-            }
-
-            return userEntity.FromEntityToDTO();
-
-        }
-
-        public IEnumerable<UserDTO> GetUsers(int page, int number, UserOrderCriteria orderCriteria)
-        {
-            IQueryable<UserEntity> query = DbContext.Users.Skip((page - 1) * number).Take(number);
-            switch (orderCriteria)
-            {
-                case UserOrderCriteria.None:
-                    break;
-                case UserOrderCriteria.ById:
-                    query = query.OrderBy(s => s.Id);
-                    break;
-                case UserOrderCriteria.ByUsername:
-                    query = query.OrderBy(s => s.Username);
-                    break;
-                case UserOrderCriteria.ByEmail:
-                    query = query.OrderBy(s => s.Email);
-                    break;
-                case UserOrderCriteria.ByIsAdmin:
-                    query = query.OrderBy(s => s.IsAdmin);
-                    break;
-                default:
-                    break;
-            }
-            var users = query.ToList();
-            return users.Select(s => s.FromEntityToDTO());
-        }
-
-        public bool DeleteUser(int id)
-        {
-            var userEntity = DbContext.Users.FirstOrDefault(u => u.Id == id);
-            if (userEntity == null)
-            {
-                return false;
-            }
-
-            DbContext.Users.Remove(userEntity);
-            DbContext.SaveChangesAsync();
-            return true;
-
-        }
-
-        public UserDTO UpdateUser(int id, UserDTO user)
-        {
-            var updatingUser = DbContext.Users.FirstOrDefault(u => u.Id == id);
-            if (updatingUser == null)
-            {
-                throw new ArgumentException("Impossible de trouver l'utilisateur", nameof(id));
-            }
-
-            updatingUser.Username = user.Username;
-            updatingUser.Password = user.Password;
-            updatingUser.Email = user.Email;
-            updatingUser.IsAdmin = user.IsAdmin;
-            DbContext.SaveChangesAsync();
-            return updatingUser.FromEntityToDTO();
-
-        }
-
-        public UserDTO CreateUser(string username, string password, string email, bool isAdmin)
-        {
-            var newUserEntity = new UserDTO
-            {
-                Username = username,
-                Password = password,
-                Email = email,
-                IsAdmin = isAdmin
-            };
-            DbContext.Users.Add(newUserEntity.FromDTOToEntity());
-            DbContext.SaveChangesAsync();
-            return newUserEntity;
-
-        }
-    }
-}
diff --git a/API_SQLuedo/TestConsoleAPI/Program.cs b/API_SQLuedo/TestConsoleAPI/Program.cs
index 9243568..a3b4275 100644
--- a/API_SQLuedo/TestConsoleAPI/Program.cs
+++ b/API_SQLuedo/TestConsoleAPI/Program.cs
@@ -13,7 +13,7 @@ using Model.OrderCriteria;
 using Service_LessonDataService = DbDataManager.Service.LessonDataService;
 using Service_ParagraphDataService = DbDataManager.Service.ParagraphDataService;
 using Service_SuccessDataService = DbDataManager.Service.SuccessDataService;
-using UserDataService = Shared.UserDataService;
+using Service_UserDataService = DbDataManager.Service.UserDataService;
 
 var connection = new SqliteConnection("DataSource=:memory:");
 connection.Open();
@@ -30,13 +30,16 @@ ILogger<SuccessesController> successLogger = factory.CreateLogger<SuccessesContr
 
 using (var context = new UserDbContext(options))
 {
-    var userController = new UsersController(userLogger, new UserDataService(context));
+    var userController = new UsersController(userLogger, new UserDataServiceApi(new Service_UserDataService(context)));
     var inquiryController =
         new InquiriesController(new InquiryDataServiceApi(new InquiryDataService(context)), inquiryLogger);
-    var paragraphController = new ParagraphsController(new ParagraphDataServiceApi(new Service_ParagraphDataService(context)), paragraphLogger);
+    var paragraphController =
+        new ParagraphsController(new ParagraphDataServiceApi(new Service_ParagraphDataService(context)),
+            paragraphLogger);
     var lessonController =
         new LessonsController(new LessonDataServiceApi(new Service_LessonDataService(context)), lessonLogger);
-    var successController = new SuccessesController(new SuccessDataServiceApi(new Service_SuccessDataService(context)), successLogger);
+    var successController = new SuccessesController(new SuccessDataServiceApi(new Service_SuccessDataService(context)),
+        successLogger);
 
     void PrintUsers()
     {