diff --git a/site/code/index.html.js b/site/code/index.html.js
index 6a22c3fd22..1a6c1c4d9c 100644
--- a/site/code/index.html.js
+++ b/site/code/index.html.js
@@ -51,12 +51,14 @@ In addition to the GraphQL [reference implementations in JavaScript](#javascript
 
 \`\`\`csharp
 using System;
+using System.Threading.Tasks;
 using GraphQL;
 using GraphQL.Types;
+using GraphQL.SystemTextJson; // First add PackageReference to GraphQL.SystemTextJson
 
 public class Program
 {
-  public static void Main(string[] args)
+  public static async Task Main(string[] args)
   {
     var schema = Schema.For(@"
       type Query {
@@ -64,7 +66,7 @@ public class Program
       }
     ");
 
-    var json = schema.Execute(_ =>
+    var json = await schema.ExecuteAsync(_ =>
     {
       _.Query = "{ hello }";
       _.Root = new { Hello = "Hello World!" };