diff --git a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/Program.cs b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/Program.cs
index 7845d76dd1..0226e0a554 100644
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/Program.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/Program.cs
@@ -1,3 +1,4 @@
+using System;
 using MyCompanyName.MyProjectName.Blazor.Server;
 using MyCompanyName.MyProjectName.Data;
 using Serilog;
diff --git a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/Program.cs b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/Program.cs
index 930acf5691..c4c428b90d 100644
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/Program.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/Program.cs
@@ -1,3 +1,4 @@
+using System;
 using MyCompanyName.MyProjectName.Data;
 using Serilog;
 using Serilog.Events;
diff --git a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/Program.cs b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/Program.cs
index 31ad6e076a..358f8dda73 100644
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/Program.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/Program.cs
@@ -1,3 +1,4 @@
+using System;
 using MyCompanyName.MyProjectName.Data;
 using Serilog;
 using Serilog.Events;
diff --git a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/EntityFrameworkCore/MyProjectNameDbContextFactory.cs b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/EntityFrameworkCore/MyProjectNameDbContextFactory.cs
index c9831de671..ddeca6a250 100644
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/EntityFrameworkCore/MyProjectNameDbContextFactory.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/EntityFrameworkCore/MyProjectNameDbContextFactory.cs
@@ -1,4 +1,5 @@
-using System.IO;
+using System;
+using System.IO;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Design;
 using Microsoft.Extensions.Configuration;
diff --git a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/EntityFrameworkCore/MyProjectNameEntityFrameworkCoreModule.cs b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/EntityFrameworkCore/MyProjectNameEntityFrameworkCoreModule.cs
index 447786a968..f655a22a24 100644
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/EntityFrameworkCore/MyProjectNameEntityFrameworkCoreModule.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/EntityFrameworkCore/MyProjectNameEntityFrameworkCoreModule.cs
@@ -1,4 +1,5 @@
-using Microsoft.Extensions.DependencyInjection;
+using System;
+using Microsoft.Extensions.DependencyInjection;
 using Volo.Abp.AuditLogging.EntityFrameworkCore;
 using Volo.Abp.BackgroundJobs.EntityFrameworkCore;
 using Volo.Abp.EntityFrameworkCore;