diff --git a/dotnet/src/Easydict.TranslationService/Services/DeepLService.cs b/dotnet/src/Easydict.TranslationService/Services/DeepLService.cs
index 542af83..3ad67cb 100644
--- a/dotnet/src/Easydict.TranslationService/Services/DeepLService.cs
+++ b/dotnet/src/Easydict.TranslationService/Services/DeepLService.cs
@@ -156,10 +156,10 @@ private async Task<TranslationResult> TranslateWebAsync(
         TranslationRequest request,
         CancellationToken cancellationToken)
     {
-        var targetCode = GetDeepLWebLanguageCode(request.ToLanguage);
+        var targetCode = GetDeepLLanguageCode(request.ToLanguage, isWeb: true);
         var sourceCode = request.FromLanguage == Language.Auto
             ? "auto"
-            : GetDeepLWebLanguageCode(request.FromLanguage);
+            : GetDeepLLanguageCode(request.FromLanguage, isWeb: true);
 
         // Generate anti-detection values (matching macOS implementation)
         var requestId = GetRandomRequestId();
@@ -385,9 +385,10 @@ private TranslationResult ParseWebResponse(string json, TranslationRequest reque
     }
 
     /// <summary>
-    /// Get language code for official DeepL API.
+    /// Get language code for DeepL API or web JSON-RPC.
+    /// The only difference is Portuguese: API uses "PT", web uses "PT-PT".
     /// </summary>
-    private static string GetDeepLLanguageCode(Language language) => language switch
+    private static string GetDeepLLanguageCode(Language language, bool isWeb = false) => language switch
     {
         Language.SimplifiedChinese => "ZH",
         Language.TraditionalChinese => "ZH-HANT",
@@ -396,40 +397,7 @@ private TranslationResult ParseWebResponse(string json, TranslationRequest reque
         Language.Korean => "KO",
         Language.French => "FR",
         Language.Spanish => "ES",
-        Language.Portuguese => "PT",
-        Language.Italian => "IT",
-        Language.German => "DE",
-        Language.Russian => "RU",
-        Language.Dutch => "NL",
-        Language.Polish => "PL",
-        Language.Bulgarian => "BG",
-        Language.Czech => "CS",
-        Language.Danish => "DA",
-        Language.Finnish => "FI",
-        Language.Greek => "EL",
-        Language.Hungarian => "HU",
-        Language.Indonesian => "ID",
-        Language.Norwegian => "NB",
-        Language.Romanian => "RO",
-        Language.Swedish => "SV",
-        Language.Turkish => "TR",
-        Language.Ukrainian => "UK",
-        _ => language.ToIso639().ToUpper()
-    };
-
-    /// <summary>
-    /// Get language code for DeepL web JSON-RPC (slightly different format).
-    /// </summary>
-    private static string GetDeepLWebLanguageCode(Language language) => language switch
-    {
-        Language.SimplifiedChinese => "ZH",
-        Language.TraditionalChinese => "ZH-HANT",
-        Language.English => "EN",
-        Language.Japanese => "JA",
-        Language.Korean => "KO",
-        Language.French => "FR",
-        Language.Spanish => "ES",
-        Language.Portuguese => "PT-PT",
+        Language.Portuguese => isWeb ? "PT-PT" : "PT",
         Language.Italian => "IT",
         Language.German => "DE",
         Language.Russian => "RU",
diff --git a/dotnet/src/Easydict.TranslationService/Services/GeminiService.cs b/dotnet/src/Easydict.TranslationService/Services/GeminiService.cs
index 9ee4329..8dd62f4 100644
--- a/dotnet/src/Easydict.TranslationService/Services/GeminiService.cs
+++ b/dotnet/src/Easydict.TranslationService/Services/GeminiService.cs
@@ -169,6 +169,7 @@ private static async IAsyncEnumerable<string> ParseGeminiStreamAsync(
     {
         using var reader = new StreamReader(stream);
 
+
         while (!reader.EndOfStream)
         {
             var line = await reader.ReadLineAsync(cancellationToken);
diff --git a/dotnet/src/Easydict.WinUI/Services/HotkeyService.cs b/dotnet/src/Easydict.WinUI/Services/HotkeyService.cs
index c20228d..4986417 100644
--- a/dotnet/src/Easydict.WinUI/Services/HotkeyService.cs
+++ b/dotnet/src/Easydict.WinUI/Services/HotkeyService.cs
@@ -26,8 +26,8 @@ public sealed class HotkeyService : IDisposable
 
     private readonly Window _window;
     private readonly nint _hwnd;
-    private bool _isDisposed;
-    private bool _isInitialized;
+    private volatile bool _isDisposed;
+    private volatile bool _isInitialized;
 
     // Window subclass delegate - must keep reference to prevent GC
     private delegate nint SubclassProc(nint hWnd, uint uMsg, nint wParam, nint lParam, nuint uIdSubclass, nuint dwRefData);
diff --git a/dotnet/tests/Easydict.TranslationService.Tests/Services/DoubaoServiceTests.cs b/dotnet/tests/Easydict.TranslationService.Tests/Services/DoubaoServiceTests.cs
index 808234d..f31d751 100644
--- a/dotnet/tests/Easydict.TranslationService.Tests/Services/DoubaoServiceTests.cs
+++ b/dotnet/tests/Easydict.TranslationService.Tests/Services/DoubaoServiceTests.cs
@@ -387,6 +387,37 @@ public async Task TranslateStreamAsync_SendsBearerToken()
         auth.Should().Be("Bearer my-doubao-key");
     }
 
+    [Fact]
+    public async Task TranslateAsync_TrimsWhitespace_WhenNoSurroundingQuotes()
+    {
+        // Arrange
+        _service.Configure("test-key");
+
+        var sseContent = new StringBuilder();
+        sseContent.AppendLine("event: response.output_text.delta");
+        sseContent.AppendLine("""data: {"delta":"  Hello World \n"}""");
+        sseContent.AppendLine();
+        sseContent.AppendLine("data: [DONE]");
+
+        var response = new HttpResponseMessage(HttpStatusCode.OK)
+        {
+            Content = new StringContent(sseContent.ToString(), Encoding.UTF8, "text/event-stream")
+        };
+        _mockHandler.EnqueueResponse(response);
+
+        var request = new TranslationRequest
+        {
+            Text = "你好世界",
+            ToLanguage = Language.English
+        };
+
+        // Act
+        var result = await _service.TranslateAsync(request);
+
+        // Assert - whitespace should be trimmed even without surrounding quotes
+        result.TranslatedText.Should().Be("Hello World");
+    }
+
     [Theory]
     [InlineData(Language.SimplifiedChinese, "zh")]
     [InlineData(Language.TraditionalChinese, "zh-Hant")]