fix code fence language tags

Author: jwmsft

hub/apps/develop/security/compare-buffers.md

@@ -13,7 +13,7 @@ ms.localizationpriority: medium
 
 This example code shows how to compare buffers in a WinUI app.
 
-```cs
+```csharp
 public void CompareBuffers()
 {
     // Create a hexadecimal string.

hub/apps/develop/security/convert-between-strings-binary-data.md

@@ -13,7 +13,7 @@ ms.localizationpriority: medium
 
 This example code shows how to convert between strings and binary data in a WinUI app.
 
-```cs
+```csharp
 public void ConvertData()
 {
     // Create a string to convert.

hub/apps/develop/security/copy-to-from-byte-arrays.md

@@ -13,7 +13,7 @@ ms.localizationpriority: medium
 
 This example code shows how to copy to and from byte arrays in a WinUI app.
 
-```cs
+```csharp
 public void ByteArrayCopy()
 {
     // Initialize a byte array.

hub/apps/develop/security/create-random-numbers.md

@@ -13,7 +13,7 @@ ms.localizationpriority: medium
 
 This example code shows how to create a random number or buffer for use in cryptography in a WinUI app.
 
-```cs
+```csharp
 public string GenerateRandomData()
 {
     // Define the length, in bytes, of the buffer.

hub/apps/develop/security/data-protection.md

@@ -27,7 +27,7 @@ To protect data, when you create a [**DataProtectionProvider**](/uwp/api/Windows
 
 The following example shows how to use the [**ProtectAsync**](/uwp/api/windows.security.cryptography.dataprotection.dataprotectionprovider.protectasync) and [**UnprotectAsync**](/uwp/api/windows.security.cryptography.dataprotection.dataprotectionprovider.unprotectasync) methods to asynchronously protect static data to the current user's SID.
 
-```cs
+```csharp
 using Windows.Security.Cryptography;
 using Windows.Security.Cryptography.DataProtection;
 using Windows.Storage.Streams;
@@ -112,7 +112,7 @@ namespace SampleProtectAsync
 
 The following example shows how to use the [**ProtectStreamAsync**](/uwp/api/windows.security.cryptography.dataprotection.dataprotectionprovider.protectstreamasync) and [**UnprotectStreamAsync**](/uwp/api/windows.security.cryptography.dataprotection.dataprotectionprovider.unprotectstreamasync) methods to asynchronously protect stream data to the current user's SID.
 
-```cs
+```csharp
 using Windows.Security.Cryptography;
 using Windows.Security.Cryptography.DataProtection;
 using Windows.Storage.Streams;

hub/apps/develop/security/encode-decode-data.md

@@ -13,7 +13,7 @@ ms.localizationpriority: medium
 
 This example code shows how to encode and decode base64 and hexadecimal data in a WinUI app.
 
-```cs
+```csharp
 public void EncodeDecodeBase64()
 {
     // Define a Base64 encoded string.

hub/apps/develop/security/macs-hashes-signatures.md

@@ -34,7 +34,7 @@ Digital signatures are the public key equivalent of private key message authenti
 
 This example code shows how to use the [**MacAlgorithmProvider**](/uwp/api/Windows.Security.Cryptography.Core.MacAlgorithmProvider) class to create a hashed message authentication code (HMAC).
 
-```cs
+```csharp
 using Windows.Security.Cryptography;
 using Windows.Security.Cryptography.Core;
 using Windows.Storage.Streams;
@@ -137,7 +137,7 @@ Digital signatures are the public key equivalent of private key message authenti
 
 The [**CryptographicHash**](/uwp/api/Windows.Security.Cryptography.Core.CryptographicHash) object can be used to repeatedly hash different data without having to re-create the object for each use. The [**Append**](/uwp/api/windows.security.cryptography.core.cryptographichash.append) method adds new data to a buffer to be hashed. The [**GetValueAndReset**](/uwp/api/windows.security.cryptography.core.cryptographichash.getvalueandreset) method hashes the data and resets the object for another use. This is shown by the following example.
 
-```cs
+```csharp
 public void SampleReusableHash()
 {
     // Create a string that contains the name of the hashing algorithm to use.