Create request-status.cs

Add request-status C# example for .NET

DotNET/Endpoint Examples/Multipart Payload/request-status.cs

@@ -0,0 +1,17 @@
+using System.Text;
+
+using (var httpClient = new HttpClient { BaseAddress = new Uri("https://api.pdfrest.com") })
+{
+    string requestId = "xxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";  // requestId to poll
+    using (var request = new HttpRequestMessage(HttpMethod.Get, "request-status" + requestId))
+    {
+        request.Headers.TryAddWithoutValidation("Api-Key", "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx");
+
+        var response = await httpClient.SendAsync(request);
+
+        var apiResult = await response.Content.ReadAsStringAsync();
+
+        Console.WriteLine("API response received.");
+        Console.WriteLine(apiResult);
+    }
+}