diff --git a/src/CSharp/EasyMicroservices.Cores.AspCore.Tests/Program.cs b/src/CSharp/EasyMicroservices.Cores.AspCore.Tests/Program.cs
index 11b15b1..0225cfc 100644
--- a/src/CSharp/EasyMicroservices.Cores.AspCore.Tests/Program.cs
+++ b/src/CSharp/EasyMicroservices.Cores.AspCore.Tests/Program.cs
@@ -16,7 +16,7 @@ public static async Task Main(string[] args)
             app.Services.AddTransient(serviceProvider => new MyTestContext(serviceProvider.GetService<IEntityFrameworkCoreDatabaseBuilder>()));
             app.Services.AddScoped<IEntityFrameworkCoreDatabaseBuilder>(serviceProvider => new DatabaseBuilder());
 
-            var build = app.Build<MyTestContext>();
+            var build = await app.Build<MyTestContext>();
             build.MapControllers();
             build.Run();
         }
diff --git a/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/EasyMicroservices.Cores.AspEntityFrameworkCoreApi.csproj b/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/EasyMicroservices.Cores.AspEntityFrameworkCoreApi.csproj
index d911541..39012bc 100644
--- a/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/EasyMicroservices.Cores.AspEntityFrameworkCoreApi.csproj
+++ b/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/EasyMicroservices.Cores.AspEntityFrameworkCoreApi.csproj
@@ -5,7 +5,7 @@
     <Platforms>AnyCPU;x64;x86</Platforms>
     <Authors>EasyMicroservices</Authors>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>0.0.0.8</Version>
+    <Version>0.0.0.9</Version>
     <Description>asp core servces.</Description>
     <Copyright>EasyMicroservices@gmail.com</Copyright>
     <PackageTags>core,cores,base,database,services,asp,aspnet,aspcore,efcore</PackageTags>
diff --git a/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/StartUpExtensions.cs b/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/StartUpExtensions.cs
index 3bb94bf..21fc411 100644
--- a/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/StartUpExtensions.cs
+++ b/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/StartUpExtensions.cs
@@ -108,7 +108,7 @@ public static async Task Build<TContext>(this IApplicationBuilder app)
                 var dbbuilder = new DatabaseCreator();
                 using var context = scope.ServiceProvider.GetRequiredService<TContext>();
                 dbbuilder.Initialize(context);
-                var uow = scope.ServiceProvider.GetRequiredService<IUnitOfWork>() as UnitOfWork;
+                using var uow = scope.ServiceProvider.GetRequiredService<IUnitOfWork>() as UnitOfWork;
                 await uow.Initialize("TextExample", "http://localhost:6041", typeof(TContext)).ConfigureAwait(false);
             }
             var build = app.Build();
@@ -121,7 +121,7 @@ public static async Task Build<TContext>(this IApplicationBuilder app)
         /// <typeparam name="TContext"></typeparam>
         /// <param name="app"></param>
         /// <returns></returns>
-        public static WebApplication Build<TContext>(this WebApplicationBuilder app)
+        public static async Task<WebApplication> Build<TContext>(this WebApplicationBuilder app)
             where TContext : RelationalCoreContext
         {
             var build = app.Build();
@@ -139,6 +139,8 @@ public static WebApplication Build<TContext>(this WebApplicationBuilder app)
                 var dbbuilder = new DatabaseCreator();
                 using var context = scope.ServiceProvider.GetRequiredService<TContext>();
                 dbbuilder.Initialize(context);
+                using var uow = scope.ServiceProvider.GetRequiredService<IUnitOfWork>() as UnitOfWork;
+                await uow.Initialize("TextExample", "http://localhost:6041", typeof(TContext)).ConfigureAwait(false);
             }
             return build;
         }
diff --git a/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/UnitOfWork.cs b/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/UnitOfWork.cs
index cce8e8c..561820f 100644
--- a/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/UnitOfWork.cs
+++ b/src/CSharp/EasyMicroservices.Cores.AspEntityFrameworkCoreApi/UnitOfWork.cs
@@ -50,7 +50,7 @@ T AddDisposable<T>(T data)
         /// 
         /// </summary>
         /// <returns></returns>
-        public IDatabase GetDatabase()
+        public virtual IDatabase GetDatabase()
         {
             var context = _service.GetService<RelationalCoreContext>();
             if (context == null)
@@ -224,7 +224,7 @@ public virtual IEasyReadableQueryableAsync<TEntity> GetReadableQueryable<TEntity
         /// <typeparam name="TContext"></typeparam>
         /// <returns></returns>
         /// <exception cref="NotImplementedException"></exception>
-        public IDatabase GetDatabase<TContext>()
+        public virtual IDatabase GetDatabase<TContext>()
                 where TContext : RelationalCoreContext
         {
             var context = _service.GetService<TContext>();
@@ -239,9 +239,12 @@ public IDatabase GetDatabase<TContext>()
         /// </summary>
         /// <returns></returns>
         /// <exception cref="NotImplementedException"></exception>
-        public IMapperProvider GetMapper()
+        public virtual IMapperProvider GetMapper()
         {
-            var mapper = new CompileTimeMapperProvider(new SerializerMapperProvider(new NewtonsoftJsonProvider()));
+            var mapper = new CompileTimeMapperProvider(new SerializerMapperProvider(new NewtonsoftJsonProvider(new Newtonsoft.Json.JsonSerializerSettings()
+            {
+                ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
+            })));
             if (MapperTypeAssembly != null)
             {
                 foreach (var type in MapperTypeAssembly.Assembly.GetTypes())
@@ -274,7 +277,7 @@ public IMapperProvider GetMapper()
         /// </summary>
         /// <returns></returns>
         /// <exception cref="NotImplementedException"></exception>
-        public IUniqueIdentityManager GetUniqueIdentityManager()
+        public virtual IUniqueIdentityManager GetUniqueIdentityManager()
         {
             if (UniqueIdentityManager == null)
                 UniqueIdentityManager = new DefaultUniqueIdentityManager(DefaultUniqueIdentity, MicroserviceId);
@@ -288,7 +291,7 @@ public IUniqueIdentityManager GetUniqueIdentityManager()
         /// <param name="whiteLableRoute"></param>
         /// <param name="dbContextTypes"></param>
         /// <returns></returns>
-        public Task Initialize(string microserviceName, string whiteLableRoute, params Type[] dbContextTypes)
+        public virtual Task Initialize(string microserviceName, string whiteLableRoute, params Type[] dbContextTypes)
         {
             return new WhiteLabelManager(_service).Initialize(microserviceName, whiteLableRoute, dbContextTypes);
         }
@@ -297,7 +300,7 @@ public Task Initialize(string microserviceName, string whiteLableRoute, params T
         /// 
         /// </summary>
         /// <exception cref="NotImplementedException"></exception>
-        public void Dispose()
+        public virtual void Dispose()
         {
             foreach (var item in Disposables)
             {
@@ -312,7 +315,7 @@ public void Dispose()
         /// 
         /// </summary>
         /// <returns></returns>
-        public async ValueTask DisposeAsync()
+        public virtual async ValueTask DisposeAsync()
         {
             foreach (var item in Disposables)
             {