diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/DropdownsDemo/DropDownDemoDemoModel.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/DropdownsDemo/DropDownDemoDemoModel.cs
index 2ef2cb39ae..3399b88a70 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/DropdownsDemo/DropDownDemoDemoModel.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/DropdownsDemo/DropDownDemoDemoModel.cs
@@ -6,11 +6,11 @@ public class DropDownDemoDemoModel
 {
     [Required]
     [EmailAddress]
-    public string EmailAddress { get; set; }
+    public string EmailAddress { get; set; } = default!;
 
     [Required]
     [DataType(DataType.Password)]
-    public string Password { get; set; }
+    public string Password { get; set; } = default!;
 
     public bool RememberMe { get; set; }
 }
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/DynamicFormsDemo/DynamicFormsDemoModel.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/DynamicFormsDemo/DynamicFormsDemoModel.cs
index bebf364ba9..48853c9552 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/DynamicFormsDemo/DynamicFormsDemoModel.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/DynamicFormsDemo/DynamicFormsDemoModel.cs
@@ -40,7 +40,7 @@ public class DynamicFormsDemoModel
         [Required]
         [DataType(DataType.Password)]
         [Display(Name = "Password")]
-        public string Password { get; set; }
+        public string Password { get; set; } = default!;
 
         [Display(Name = "Is Active")]
         public bool IsActive { get; set; }
@@ -87,34 +87,34 @@ public class DynamicFormsDemoModel
     public class OrderExampleModel
     {
         [DisplayOrder(10005)]
-        public string Surname { get; set; }
+        public string? Surname { get; set; }
 
         //Default 10000
-        public string EmailAddress { get; set; }
+        public string? EmailAddress { get; set; }
 
         [DisplayOrder(10003)]
-        public string Name { get; set; }
+        public string? Name { get; set; }
 
         [DisplayOrder(9999)]
-        public string City { get; set; }
+        public string? City { get; set; }
     }
 
     public class AttributeExamplesModel
     {
         [HiddenInput]
-        public string HiddenInput { get; set; }
+        public string? HiddenInput { get; set; }
 
         [DisabledInput]
-        public string DisabledInput { get; set; }
+        public string? DisabledInput { get; set; }
 
         [ReadOnlyInput]
-        public string ReadonlyInput { get; set; }
+        public string? ReadonlyInput { get; set; }
 
         [FormControlSize(AbpFormControlSize.Large)]
-        public string LargeInput { get; set; }
+        public string? LargeInput { get; set; }
 
         [FormControlSize(AbpFormControlSize.Small)]
-        public string SmallInput { get; set; }
+        public string? SmallInput { get; set; }
     }
 
     public DetailedModel MyDetailedModel { get; set; }
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/FormElementsDemo/FormElementsDemoModel.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/FormElementsDemo/FormElementsDemoModel.cs
index 5dc339ef6c..f9c5326471 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/FormElementsDemo/FormElementsDemoModel.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/FormElementsDemo/FormElementsDemoModel.cs
@@ -26,11 +26,11 @@ public class FormElementsDemoModel
     public class InformMeModel
     {
         [Required]
-        public string Name { get; set; }
+        public string Name { get; set; } = default!;
 
         [Required]
         [DataType(DataType.Password)]
-        public string Password { get; set; }
+        public string Password { get; set; } = default!;
 
         public bool CheckMeOut { get; set; }
     }
@@ -38,14 +38,14 @@ public class FormElementsDemoModel
     public class DetailsModel
     {
         [Required]
-        public string EmailAddress { get; set; }
+        public string EmailAddress { get; set; } = default!;
 
-        public string City { get; set; }
+        public string? City { get; set; }
 
-        public List<string> Cities { get; set; }
+        public List<string>? Cities { get; set; }
 
         [TextArea]
-        public string Description { get; set; }
+        public string? Description { get; set; }
     }
 
     public class CheckboxModel
@@ -58,7 +58,7 @@ public class FormElementsDemoModel
     public class CityRadioModel
     {
         [Display(Name = "City")]
-        public string CityRadio { get; set; }
+        public string? CityRadio { get; set; }
     }
 
     public class EnumModel
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/PaginatorDemo/PaginatorDemoViewComponent.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/PaginatorDemo/PaginatorDemoViewComponent.cs
index e5a02582a1..c19fdf54fb 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/PaginatorDemo/PaginatorDemoViewComponent.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/Demos/PaginatorDemo/PaginatorDemoViewComponent.cs
@@ -13,7 +13,7 @@ public class PaginatorDemoViewComponent : AbpViewComponent
 {
     public const string ViewPath = "/Views/Components/Themes/Shared/Demos/PaginatorDemo/Default.cshtml";
 
-    public PagerModel PagerModel { get; set; }
+    public PagerModel PagerModel { get; set; } = default!;
 
     public IViewComponentResult Invoke(PagerModel pagerModel)
     {
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/TagHelpers/AbpComponentDemoSectionTagHelper.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/TagHelpers/AbpComponentDemoSectionTagHelper.cs
index e3b6a15b46..29359bfabc 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/TagHelpers/AbpComponentDemoSectionTagHelper.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/TagHelpers/AbpComponentDemoSectionTagHelper.cs
@@ -14,8 +14,8 @@ public class AbpComponentDemoSectionTagHelper : AbpTagHelper
     private const string DemoSectionOpeningTag = "<abp-component-demo-section";
     private const string DemoSectionClosingTag = "</abp-component-demo-section";
 
-    public string ViewPath { get; set; }
-    public string Title { get; set; }
+    public string ViewPath { get; set; } = default!;
+    public string? Title { get; set; }
 
     private readonly IVirtualFileProvider _virtualFileProvider;
     private readonly IGuidGenerator _guidGenerator;
@@ -101,7 +101,7 @@ public class AbpComponentDemoSectionTagHelper : AbpTagHelper
 
     private string GetRawDemoSource()
     {
-        StringBuilder sourceBuilder = null;
+        StringBuilder? sourceBuilder = null;
 
         var lines = GetFileContent().SplitToLines();
 
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo.csproj b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo.csproj
index c576f7897d..56da56c227 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo.csproj
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo.csproj
@@ -5,6 +5,8 @@
 
   <PropertyGroup>
     <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
     <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
     <AssemblyName>Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo</AssemblyName>
     <PackageId>Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo</PackageId>