diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/GlobalFilterDefinition.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/GlobalFilterDefinition.cs
index d7e52a604e..f599f0c797 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/GlobalFilterDefinition.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/GlobalFilterDefinition.cs
@@ -1,7 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using JetBrains.Annotations;
 using Volo.Abp.Localization;
 
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/IDashboardRenderer.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/IDashboardRenderer.cs
index 64e149696f..7cfed80135 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/IDashboardRenderer.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/IDashboardRenderer.cs
@@ -1,7 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using Microsoft.AspNetCore.Html;
 using Microsoft.AspNetCore.Mvc;
 using Volo.Abp.DependencyInjection;
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Widgets/Volo/Abp/AspNetCore/Mvc/UI/Widgets/AbpAspNetCoreMvcUiWidgetsModule.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Widgets/Volo/Abp/AspNetCore/Mvc/UI/Widgets/AbpAspNetCoreMvcUiWidgetsModule.cs
index 1644fe342c..955bb868a8 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Widgets/Volo/Abp/AspNetCore/Mvc/UI/Widgets/AbpAspNetCoreMvcUiWidgetsModule.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Widgets/Volo/Abp/AspNetCore/Mvc/UI/Widgets/AbpAspNetCoreMvcUiWidgetsModule.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.ViewComponents;
 using Microsoft.Extensions.DependencyInjection;
 using Volo.Abp.AspNetCore.Mvc.UI.Bootstrap;
diff --git a/samples/DashboardDemo/src/DashboardDemo.Web/Pages/Components/NewUserStatisticWidget/Default.cshtml b/samples/DashboardDemo/src/DashboardDemo.Web/Pages/Components/NewUserStatisticWidget/Default.cshtml
index 82bcb11f02..6a2af5bb5d 100644
--- a/samples/DashboardDemo/src/DashboardDemo.Web/Pages/Components/NewUserStatisticWidget/Default.cshtml
+++ b/samples/DashboardDemo/src/DashboardDemo.Web/Pages/Components/NewUserStatisticWidget/Default.cshtml
@@ -11,7 +11,7 @@
                         <option value="Monthly">Monthly</option>
                     </select>
                 </div>
-            </div
+            </div>
             <div class="row mt-5">
                 <canvas id="NewUserStatisticChart" class="NewUserStatisticChart"></canvas>
             </div>