diff --git a/v2rayN/ServiceLib/Global.cs b/v2rayN/ServiceLib/Global.cs
index 5478cd2a..e3ed209d 100644
--- a/v2rayN/ServiceLib/Global.cs
+++ b/v2rayN/ServiceLib/Global.cs
@@ -95,7 +95,7 @@ public class Global
 
     public const string PolicyGroupDefaultAllFilter = $"^(?!.*(?:{PolicyGroupExcludeKeywords})).*$";
 
-    public static readonly List<string> PolicyGroupDefaultFilterList = 
+    public static readonly List<string> PolicyGroupDefaultFilterList =
     [
         // All nodes (exclude traffic/expiry info)
         PolicyGroupDefaultAllFilter,
diff --git a/v2rayN/ServiceLib/Handler/Builder/NodeValidator.cs b/v2rayN/ServiceLib/Handler/Builder/NodeValidator.cs
index a6adf1c2..65110b2a 100644
--- a/v2rayN/ServiceLib/Handler/Builder/NodeValidator.cs
+++ b/v2rayN/ServiceLib/Handler/Builder/NodeValidator.cs
@@ -81,7 +81,9 @@ public class NodeValidator
         {
             var transportError = ValidateSingboxTransport(item.ConfigType, net);
             if (transportError != null)
+            {
                 v.Error(transportError);
+            }
 
             if (!Global.SingboxSupportConfigType.Contains(item.ConfigType))
             {
diff --git a/v2rayN/ServiceLib/Handler/ConfigHandler.cs b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
index eba4f4b5..3c587676 100644
--- a/v2rayN/ServiceLib/Handler/ConfigHandler.cs
+++ b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
@@ -1040,8 +1040,8 @@ public static class ConfigHandler
 
         if (profileItem.StreamSecurity.IsNotEmpty())
         {
-            if (profileItem.StreamSecurity != Global.StreamSecurity
-                 && profileItem.StreamSecurity != Global.StreamSecurityReality)
+            if (profileItem.StreamSecurity is not Global.StreamSecurity
+                 and not Global.StreamSecurityReality)
             {
                 profileItem.StreamSecurity = string.Empty;
             }
diff --git a/v2rayN/ServiceLib/Models/ServerTestItem.cs b/v2rayN/ServiceLib/Models/ServerTestItem.cs
index beef2438..00e26b83 100644
--- a/v2rayN/ServiceLib/Models/ServerTestItem.cs
+++ b/v2rayN/ServiceLib/Models/ServerTestItem.cs
@@ -9,6 +9,6 @@ public class ServerTestItem
     public EConfigType ConfigType { get; set; }
     public bool AllowTest { get; set; }
     public int QueueNum { get; set; }
-    public required ProfileItem Profile { get; set; }
+    public ProfileItem Profile { get; set; }
     public ECoreType CoreType { get; set; }
 }
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxDnsService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxDnsService.cs
index afab27d9..f09d3ee9 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxDnsService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxDnsService.cs
@@ -243,7 +243,6 @@ public partial class CoreConfigSingboxService
                 if (Utils.IsIpv6(predefined))
                 {
                     rule.answer = new List<string> { $"*. IN AAAA {predefined}" };
-
                 }
                 else
                 {
diff --git a/v2rayN/v2rayN.Desktop/Views/ClashConnectionsView.axaml.cs b/v2rayN/v2rayN.Desktop/Views/ClashConnectionsView.axaml.cs
index 23722ad0..4bf5237b 100644
--- a/v2rayN/v2rayN.Desktop/Views/ClashConnectionsView.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/ClashConnectionsView.axaml.cs
@@ -8,9 +8,9 @@ public partial class ClashConnectionsView : ReactiveUserControl<ClashConnections
     public ClashConnectionsView()
     {
         InitializeComponent();
-        
+
         _config = AppManager.Instance.Config;
-        
+
         ViewModel = new ClashConnectionsViewModel(UpdateViewHandler);
         btnAutofitColumnWidth.Click += BtnAutofitColumnWidth_Click;
 
@@ -65,7 +65,7 @@ public partial class ClashConnectionsView : ReactiveUserControl<ClashConnections
     {
         ViewModel?.ClashConnectionClose(false);
     }
-    
+
     #region UI
 
     private void RestoreUI()
diff --git a/v2rayN/v2rayN/Views/ProfilesSelectWindow.xaml.cs b/v2rayN/v2rayN/Views/ProfilesSelectWindow.xaml.cs
index e357044c..5122b1f4 100644
--- a/v2rayN/v2rayN/Views/ProfilesSelectWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/ProfilesSelectWindow.xaml.cs
@@ -97,8 +97,7 @@ public partial class ProfilesSelectWindow
 
     private void LstProfiles_ColumnHeader_Click(object sender, RoutedEventArgs e)
     {
-        var colHeader = sender as DataGridColumnHeader;
-        if (colHeader == null || colHeader.TabIndex < 0 || colHeader.Column == null)
+        if (sender is not DataGridColumnHeader colHeader || colHeader.TabIndex < 0 || colHeader.Column == null)
         {
             return;
         }
diff --git a/v2rayN/v2rayN/Views/ProfilesView.xaml.cs b/v2rayN/v2rayN/Views/ProfilesView.xaml.cs
index 1440e6ec..b088fe7b 100644
--- a/v2rayN/v2rayN/Views/ProfilesView.xaml.cs
+++ b/v2rayN/v2rayN/Views/ProfilesView.xaml.cs
@@ -233,8 +233,7 @@ public partial class ProfilesView
 
     private void LstProfiles_ColumnHeader_Click(object sender, RoutedEventArgs e)
     {
-        var colHeader = sender as DataGridColumnHeader;
-        if (colHeader == null || colHeader.TabIndex < 0 || colHeader.Column == null)
+        if (sender is not DataGridColumnHeader colHeader || colHeader.TabIndex < 0 || colHeader.Column == null)
         {
             return;
         }