diff --git a/DnsServerCore/WebServiceDashboardApi.cs b/DnsServerCore/WebServiceDashboardApi.cs
index e7522346..130abd97 100644
--- a/DnsServerCore/WebServiceDashboardApi.cs
+++ b/DnsServerCore/WebServiceDashboardApi.cs
@@ -141,7 +141,7 @@ namespace DnsServerCore
             Dictionary<string, List<KeyValuePair<string, long>>> data;
             string labelFormat;
 
-            switch (strType.ToLower())
+            switch (strType.ToLowerInvariant())
             {
                 case "lasthour":
                     data = _dnsWebService.DnsServer.StatsManager.GetLastHourMinuteWiseStats(utcFormat);
@@ -569,7 +569,7 @@ namespace DnsServerCore
 
             List<KeyValuePair<string, long>> topStatsData;
 
-            switch (strType.ToLower())
+            switch (strType.ToLowerInvariant())
             {
                 case "lasthour":
                     topStatsData = _dnsWebService.DnsServer.StatsManager.GetLastHourTopStats(statsType, limit);
diff --git a/DnsServerCore/WebServiceOtherZonesApi.cs b/DnsServerCore/WebServiceOtherZonesApi.cs
index 28939c56..57e3c30e 100644
--- a/DnsServerCore/WebServiceOtherZonesApi.cs
+++ b/DnsServerCore/WebServiceOtherZonesApi.cs
@@ -1,6 +1,6 @@
 /*
 Technitium DNS Server
-Copyright (C) 2023  Shreyas Zare (shreyas@technitium.com)
+Copyright (C) 2024  Shreyas Zare (shreyas@technitium.com)
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -20,7 +20,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 using DnsServerCore.Auth;
 using DnsServerCore.Dns.Zones;
 using Microsoft.AspNetCore.Http;
-using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Net;
@@ -81,7 +80,7 @@ namespace DnsServerCore
 
             string direction = request.QueryOrForm("direction");
             if (direction is not null)
-                direction = direction.ToLower();
+                direction = direction.ToLowerInvariant();
 
             List<string> subZones = new List<string>();
             List<DnsResourceRecord> records = new List<DnsResourceRecord>();
@@ -187,7 +186,7 @@ namespace DnsServerCore
 
             string direction = request.QueryOrForm("direction");
             if (direction is not null)
-                direction = direction.ToLower();
+                direction = direction.ToLowerInvariant();
 
             List<string> subZones = new List<string>();
             List<DnsResourceRecord> records = new List<DnsResourceRecord>();
@@ -376,7 +375,7 @@ namespace DnsServerCore
 
             string direction = request.QueryOrForm("direction");
             if (direction is not null)
-                direction = direction.ToLower();
+                direction = direction.ToLowerInvariant();
 
             List<string> subZones = new List<string>();
             List<DnsResourceRecord> records = new List<DnsResourceRecord>();