Add code example for CA1713 rule (#48953)

docs/fundamentals/code-analysis/quality-rules/ca1713.md

@@ -10,6 +10,8 @@ helpviewer_keywords:
 - EventsShouldNotHaveBeforeOrAfterPrefix
 author: gewarren
 ms.author: gewarren
+dev_langs:
+- CSharp
 ---
 # CA1713: Events should not have before or after prefix
 
@@ -35,6 +37,10 @@ Naming conventions provide a common look for libraries that target the common la
 
 Remove the prefix from the event name, and consider changing the name to use the present or past tense of a verb.
 
+## Example
+
+:::code language="csharp" source="snippets/csharp/all-rules/ca1713.cs" id="snippet1":::
+
 ## When to suppress warnings
 
 Do not suppress a warning from this rule.

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca1713.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace ca1713
+{
+    //<snippet1>
+    public class Session
+    {
+        // This code violates the rule.
+        public event EventHandler? BeforeClose;
+        public event EventHandler? AfterClose;
+
+        // This code satisfies the rule.
+        public event EventHandler? Closing;
+        public event EventHandler? Closed;
+    }
+    //</snippet1>
+}