Add code example for CA1727 rule (#48962)

docs/fundamentals/code-analysis/quality-rules/ca1727.md

@@ -9,6 +9,8 @@ helpviewer_keywords:
 - CA1727
 - LoggerMessageDefineAnalyzer
 author: Youssef1313
+dev_langs:
+- CSharp
 ---
 # CA1727: Use PascalCase for named placeholders
 
@@ -32,6 +34,10 @@ A named placeholder used with <xref:Microsoft.Extensions.Logging.ILogger> should
 
 Use PascalCase for named placeholders. For example, change `{firstName}` to `{FirstName}`.
 
+## Example
+
+:::code language="csharp" source="snippets/csharp/all-rules/ca1727.cs" id="snippet1":::
+
 ## When to suppress warnings
 
 It is safe to suppress a warning from this rule.

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca1727.cs

@@ -0,0 +1,25 @@
+using Microsoft.Extensions.Logging;
+
+namespace ca1727
+{
+    //<snippet1>
+    public class UserService
+    {
+        private readonly ILogger<UserService> _logger;
+
+        public UserService(ILogger<UserService> logger)
+        {
+            _logger = logger;
+        }
+
+        public void Create(string firstName, string lastName)
+        {
+            // This code violates the rule.
+            _logger.LogInformation("Creating user {firstName} {lastName}", firstName, lastName);
+
+            // This code satisfies the rule.
+            _logger.LogInformation("Creating user {FirstName} {LastName}", firstName, lastName);
+        }
+    }
+    //</snippet1>
+}