Add visual basic snippet code

xml/System.Net.Http/HttpClient.xml

@@ -127,6 +127,7 @@ If this change is undesirable, you can configure your application to use the old
 
 ## Examples  
  [!code-csharp[System.Net.Http.HttpClient#1](~/samples/snippets/csharp/VS_Snippets_Misc/system.net.http.httpclient/cs/source.cs#1)]  
+ [!code-vb[System.Net.Http.HttpClient#1](~/samples/snippets/visualbasic/VS_Snippets_Misc/system.net.http.httpclient/vb/source.vb#1)]  
 
  The preceding code example uses an `async Task Main()` entry point. That feature requires C# 7.1 or later.
 
@@ -165,8 +166,19 @@ public class GoodController : ApiController
         HttpClient = new HttpClient();  
     }  
 }  
+```
 
-```  
+```vb
+Public Class GoodController
+  Inherits ApiController  
+    ' OK  
+    Private Shared ReadOnly HttpClient As HttpClient;  
+
+    Shared Sub New()  
+        HttpClient = New HttpClient()
+    End sub
+End Class
+```
 
  ]]></format>
         </remarks>
@@ -2244,4 +2256,4 @@ httpClient.Timeout = TimeSpan.FromMinutes(10);
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>