Add code example for CA2253 rule (#49089)

docs/fundamentals/code-analysis/quality-rules/ca2253.md

@@ -9,6 +9,8 @@ helpviewer_keywords:
 - LoggerMessageDefineAnalyzer
 - CA2253
 author: Youssef1313
+dev_langs:
+- CSharp
 ---
 # CA2253: Named placeholders should not be numeric values
 
@@ -34,6 +36,10 @@ Rename the numeric placeholder.
 
 For usage examples, see the <xref:Microsoft.Extensions.Logging.LoggerExtensions.LogInformation%2A?displayProperty=nameWithType> method.
 
+## Example
+
+:::code language="csharp" source="snippets/csharp/all-rules/ca2253.cs" id="snippet1":::
+
 ## When to suppress errors
 
 Do not suppress a warning from this rule.

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca2253.cs

@@ -0,0 +1,27 @@
+using Microsoft.Extensions.Logging;
+
+namespace ca2253
+{
+    //<snippet1>
+    public class UserService
+    {
+        private readonly ILogger<UserService> _logger;
+
+        public UserService(ILogger<UserService> logger)
+        {
+            _logger = logger;
+        }
+
+        public void Add(string firstName, string lastName)
+        {
+            // This code violates the rule.
+            _logger.LogInformation("Adding user with first name {0} and last name {1}", firstName, lastName);
+
+            // This code satisfies the rule.
+            _logger.LogInformation("Adding user with first name {FirstName} and last name {LastName}", firstName, lastName);
+
+            // ...
+        }
+    }
+    //</snippet1>
+}