Add code samples for web search (#695)

* Add code samples for web search

* Update document link

* Update docs/guides/tools-web-search/responses/user-location.cs

---------

Co-authored-by: Christopher Scott <[email protected]>

Author: justinyoo

docs/guides/tools-web-search/responses/quickstart.cs

@@ -0,0 +1,25 @@
+// SAMPLE: Get information from web search through Responses API
+// PAGE: https://platform.openai.com/docs/guides/tools-web-search?api-mode=responses
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateWebSearchTool());
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart(
+            "What was a positive news story from today?"
+        )
+    ])
+], options);
+
+Console.WriteLine(response.GetOutputText());

docs/guides/tools-web-search/responses/user-location.cs

@@ -0,0 +1,31 @@
+// SAMPLE: Get information from web search by specifying user location through Responses API
+// PAGE: https://platform.openai.com/docs/guides/tools-web-search?api-mode=responses#user-location
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateWebSearchTool(
+    userLocation: WebSearchToolLocation.CreateApproximateLocation(
+        country: "GB",
+        city: "London",
+        region: "Granary Square"
+    )
+));
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart(
+            "What are the best restaurants near me?"
+        )
+    ])
+], options);
+
+Console.WriteLine(response.GetOutputText());