Added c# lid and source lang config doc

Author: susanhuhu

articles/cognitive-services/Speech-Service/how-to-automatic-language-detection.md

@@ -19,7 +19,7 @@ Automatic language detection is used to determine the most likely match for audi
 In this article, you'll learn how to use `AutoDetectSourceLanguageConfig` to construct a `SpeechRecognizer` object and retrieve the detected language.
 
 > [!IMPORTANT]
-> This feature is only available for the Speech SDK for C++ and the Speech SDK for Java.
+> This feature is only available for the Speech SDK for C#, C++ and Java.
 
 ## Automatic language detection with the Speech SDK
 
@@ -30,6 +30,17 @@ Automatic language detection currently has a services-side limit of two language
 
 The following snippets illustrate how to use automatic language detection in your apps:
 
+```csharp
+var autoDetectSourceLanguageConfig = AutoDetectSourceLanguageConfig.FromLanguages(new string[] { "en-US", "de-DE" });
+using (var recognizer = new SpeechRecognizer(speechConfig, autoDetectSourceLanguageConfig, audioConfig))
+{
+    var speechRecognitionResult = await recognizer.RecognizeOnceAsync();
+    var autoDetectSourceLanguageResult = AutoDetectSourceLanguageResult.FromResult(speechRecognitionResult);
+    var detectedLanguage = autoDetectSourceLanguageResult.Language;
+    Assert.AreEqual(Language.DE_DE, detectedLanguage);
+}
+```
+
 ```C++
 auto autoDetectSourceLanguageConfig = AutoDetectSourceLanguageConfig::FromLanguages({ "en-US", "de-DE" });
 auto recognizer = SpeechRecognizer::FromConfig(speechConfig, autoDetectSourceLanguageConfig, audioConfig);
@@ -59,6 +70,15 @@ In addition to language detection using Speech service models, you can specify a
 
 The snippets below illustrate how to specify a custom model in your call to the Speech service. If the detected language is `en-US`, then the default model is used. If the detected language is `fr-FR`, then the endpoint for the custom model is used:
 
+```csharp
+var sourceLanguageConfigs = new SourceLanguageConfig[]
+{
+    SourceLanguageConfig.FromLanguage("en-US"),
+    SourceLanguageConfig.FromLanguage("fr-FR", "The Endpoint Id for custom model of fr-FR")
+};
+var autoDetectSourceLanguageConfig = AutoDetectSourceLanguageConfig.FromSourceLanguageConfigs(sourceLanguageConfigs);
+```
+
 ```C++
 std::vector<std::shared_ptr<SourceLanguageConfig>> sourceLanguageConfigs;
 sourceLanguageConfigs.push_back(SourceLanguageConfig::FromLanguage("en-US"));

articles/cognitive-services/Speech-Service/how-to-specify-source-language.md

@@ -21,24 +21,29 @@ In this article, you'll learn how to specify the source language for an audio in
 
 ## How to specify source language in C#
 
-The first step is to create a `SpeechConfig`:
+In this example, the source language is provided explicitly as a parameter using `SpeechRecognizer` construct.
 
 ```csharp
-var speechConfig = SpeechConfig.FromSubscription("YourSubscriptionKey", "YourServiceRegion");
+var recognizer = new SpeechRecognizer(speechConfig, "de-DE", audioConfig);
 ```
 
-Next, specify the source language of your audio with `SpeechRecognitionLanguage`:
+In this example, the source language is provided using `SourceLanguageConfig`. Then, the `sourceLanguageConfig` is passed as a parameter to `SpeechRecognizer` construct.
 
 ```csharp
-speechConfig.SpeechRecognitionLanguage = "de-DE";
+var sourceLanguageConfig = SourceLanguageConfig.FromLanguage("de-DE");
+var recognizer = new SpeechRecognizer(speechConfig, sourceLanguageConfig, audioConfig);
 ```
 
-If you're using a custom model for recognition, you can specify the endpoint with `EndpointId`:
+In this example, the source language and custom endpoint are provided using `SourceLanguageConfig`. Then, the `sourceLanguageConfig` is passed as a parameter to `SpeechRecognizer` construct.
 
 ```csharp
-speechConfig.EndpointId = "The Endpoint ID for your custom model.";
+var sourceLanguageConfig = SourceLanguageConfig.FromLanguage("de-DE", "The Endpoint ID for your custom model.");
+var recognizer = new SpeechRecognizer(speechConfig, sourceLanguageConfig, audioConfig);
 ```
 
+>[!Note]
+> `SpeechRecognitionLanguage` and `EndpointId` set methods are deprecated from the `SpeechConfig` class in C#. The use of these methods are discouraged, and shouldn't be used when constructing a `SpeechRecognizer`.
+
 ::: zone-end
 
 ::: zone pivot="programming-language-cpp"