diff --git a/API_SQLuedo/API/Controllers/UserController.cs b/API_SQLuedo/API/Controllers/UserController.cs
index e261d4e..32acebe 100644
--- a/API_SQLuedo/API/Controllers/UserController.cs
+++ b/API_SQLuedo/API/Controllers/UserController.cs
@@ -4,6 +4,7 @@ using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Model.Business;
 using Model.DTO;
+using Model.Mappers;
 using Services;
 
 namespace API.Controllers
@@ -90,7 +91,8 @@ namespace API.Controllers
             }
 
             _logger.LogInformation("[INFORMATION] Un utilisateur a été créé : username - {username}, password - {password}, email - {email}, isAdmin - {isAdmin}", dto.Username, dto.Password, dto.Email, dto.IsAdmin);
-            return Created(nameof(GetUsers), _dataService.UserService.CreateUser(dto.Username, dto.Password, dto.Email, dto.IsAdmin));
+            //return Created(nameof(GetUsers), _dataService.UserService.CreateUser(dto.Username, dto.Password, dto.Email, dto.IsAdmin));
+            return Created(nameof(GetUsers), _dataService.UserService.AddItem(dto.FromDTOToModel().FromModelToEntity()));
         }
 
         [HttpPut]
diff --git a/API_SQLuedo/ModelToEntity/DbDataManager.cs b/API_SQLuedo/ModelToEntity/DbDataManager.cs
index 9e87320..2f144f4 100644
--- a/API_SQLuedo/ModelToEntity/DbDataManager.cs
+++ b/API_SQLuedo/ModelToEntity/DbDataManager.cs
@@ -158,9 +158,13 @@ namespace ModelToEntity
             throw new NotImplementedException();
         }
 
-        public Task<T?> AddItem<T>(T? item)
+        public async Task<T?> AddItem<T>(T? item) where T : class
         {
-            throw new NotImplementedException();
+            using (var context = new UserDbContext())
+            {
+                return await context.CreateItemAsync(item);
+            }
+
         }
     }
    
diff --git a/API_SQLuedo/ModelToEntity/Extension.cs b/API_SQLuedo/ModelToEntity/Extension.cs
index b63e770..63f3b3b 100644
--- a/API_SQLuedo/ModelToEntity/Extension.cs
+++ b/API_SQLuedo/ModelToEntity/Extension.cs
@@ -15,17 +15,18 @@ namespace ModelToEntity
 {
     internal static class Extension
     {
-        internal static async Task<T?> AddItemAsync<T>(this DbContext context, T? item) where T : class
+        public static Task<T?> CreateItemAsync<T>(this DbContext context, T? item) where T : class
         {
-            if (item == null || await context.Set<T>().ContainsAsync(item))
+            if (item == null ||  context.Set<T>().Contains(item))
             {
-                return default(T);
+                return Task.FromResult<T?>(default(T));
             }
 
             context.Set<T>().Add(item);
-            await context.SaveChangesAsync();
+            context.SaveChangesAsync();
 
-            return item;
+            return Task.FromResult<T?>(item); ;
         }
+
     }
 }
\ No newline at end of file
diff --git a/API_SQLuedo/Services/UserDataService.cs b/API_SQLuedo/Services/UserDataService.cs
index f46d725..a1263d8 100644
--- a/API_SQLuedo/Services/UserDataService.cs
+++ b/API_SQLuedo/Services/UserDataService.cs
@@ -56,9 +56,10 @@ namespace Services
             return newUserEntity.FromModelToDTO();
         }
 
-        public async Task<T?> AddItem<T>(T? item)
+        public async Task<T?> AddItem<T>(T? item) where T : class
         {
-            throw new NotImplementedException();
+            var newItem = dataServiceEF.AddItem(item);
+            return await newItem;
         }
     }
 }
diff --git a/API_SQLuedo/Shared/IDataService.cs b/API_SQLuedo/Shared/IDataService.cs
index 6080a02..7c3b82b 100644
--- a/API_SQLuedo/Shared/IDataService.cs
+++ b/API_SQLuedo/Shared/IDataService.cs
@@ -4,7 +4,7 @@ using Model.DTO;
 
 namespace Services
 {
-    public interface IDataService<T>
+    public interface IDataService<T> where T : class
     {
         IUserDataService<T?> UserService { get; }
         IInquiryDataService InquiryDataService { get; }
diff --git a/API_SQLuedo/Shared/IGenericService.cs b/API_SQLuedo/Shared/IGenericService.cs
index f34b3f1..fbcfb70 100644
--- a/API_SQLuedo/Shared/IGenericService.cs
+++ b/API_SQLuedo/Shared/IGenericService.cs
@@ -1,7 +1,7 @@
 namespace Shared
 {
-    public interface IGenericService<T>
+    public interface IGenericService<T> where T : class
     {
-        public Task<T?> AddItem<T>(T? item);
+        public Task<T?> AddItem<T>(T? item) where T : class;
     }
 }
diff --git a/API_SQLuedo/Shared/IUserDataService.cs b/API_SQLuedo/Shared/IUserDataService.cs
index 16cfacc..bf2f2e2 100644
--- a/API_SQLuedo/Shared/IUserDataService.cs
+++ b/API_SQLuedo/Shared/IUserDataService.cs
@@ -10,7 +10,7 @@ using Model.Business;
 
 namespace Services
 {
-    public interface IUserDataService<T> : IGenericService<T?>
+    public interface IUserDataService<T> : IGenericService<T?> where T : class
     {
         public Task<IEnumerable<T?>> GetUsers(int page, int number);
         public Task<T?> GetUserById(int id);