Add missing visual basic sample

xml/System.Net.Http/HttpClient.xml

@@ -1,4 +1,4 @@
-<Type Name="HttpClient" FullName="System.Net.Http.HttpClient">
+<Type Name="HttpClient" FullName="System.Net.Http.HttpClient">
   <TypeSignature Language="C#" Value="public class HttpClient : System.Net.Http.HttpMessageInvoker" />
   <TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit HttpClient extends System.Net.Http.HttpMessageInvoker" />
   <TypeSignature Language="DocId" Value="T:System.Net.Http.HttpClient" />
@@ -61,16 +61,27 @@
 ```csharp
 public class GoodController : ApiController
 {
-    // OK
     private static readonly HttpClient HttpClient;
 
     static GoodController()
     {
         HttpClient = new HttpClient();
     }
 }
-```  
-
+```
+
+```vb
+  Public Class GoodController
+    Inherits ApiController  
+
+    Private Shared ReadOnly HttpClient As HttpClient  
+
+    Shared Sub New()  
+        HttpClient = New HttpClient()
+    End Sub
+End Class
+```
+
 The <xref:System.Net.Http.HttpClient> is a high-level API that wraps the lower-level functionality available on each platform where it runs.
 
 On each platform, <xref:System.Net.Http.HttpClient> tries to use the best available transport:
@@ -127,7 +138,8 @@ 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.
 
  ]]></format>
@@ -157,17 +169,27 @@ If this change is undesirable, you can configure your application to use the old
 ```csharp  
 public class GoodController : ApiController  
 {  
-    // OK  
     private static readonly HttpClient HttpClient;  
 
     static GoodController()  
     {  
         HttpClient = new HttpClient();  
     }  
 }  
-
-```  
-
+```
+
+```vb
+  Public Class GoodController
+    Inherits ApiController  
+
+    Private Shared ReadOnly HttpClient As HttpClient
+
+    Shared Sub New()  
+        HttpClient = New HttpClient()
+    End Sub
+End Class
+```
+
  ]]></format>
         </remarks>
       </Docs>