Snippet (based on a Universal App) for remote compiling and running .Net code using a Microsoft .Net API endpoint

RemoteCompile.cs

using Newtonsoft.Json;
using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.Web.Http;

using static System.Environment;

namespace RemoteCompile
{
  public sealed partial class MainPage : Page
  {
    public MainPage()
    {
      this.InitializeComponent();

      //Set a "Hello World" type snippet as the default
      txtCodeIn.Text = $"using System;{NewLine}{NewLine}public class HelloWorld{NewLine}{{{NewLine}\t" + 
          $"public static void Main(){NewLine}\t{{{NewLine}\t\t" + 
          $"Console.WriteLine(\"Hello from Contos.io!\");{NewLine}\t}}{NewLine}}}";
    }

    private async void btnRun_Click(object sender, RoutedEventArgs e)
    {
      var apiURL = "https://www.microsoft.com/net/api/code";
      HttpClient client = new HttpClient();
      HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, new Uri(apiURL));
      request.Headers.Add("Referer", "https://www.microsoft.com/net");

      var codeSnippet = txtCodeIn.Text;

      var codeInput = new codeRequest { language = "csharp", captureStats = false,sources = new string[1] };
      codeInput.sources[0] = codeSnippet;

      var content = JsonConvert.SerializeObject(codeInput);
      request.Content = new HttpStringContent(content, Windows.Storage.Streams.UnicodeEncoding.Utf8, "application/json");
      client.DefaultRequestHeaders.Accept.Add(new Windows.Web.Http.Headers.HttpMediaTypeWithQualityHeaderValue("application/json"));

      HttpResponseMessage response = await client.SendRequestAsync(request);

      var responseString = response.Content.ReadAsStringAsync().GetResults();
      var codeOutput = JsonConvert.DeserializeObject<codeResponse>(responseString);
      txtCodeOut.Text = codeOutput.Output[0];
    }
  }

  //Model for the request / input
  public class codeRequest
  {
    public string language { get; set; }
    public bool captureStats { get; set; }
    public string[] sources { get; set; }
  }

  //Model for the response / output
  public class codeResponse
  {
    public string Phase { get; set; }
    public string Reason { get; set; }
    public bool Succeeded { get; set; }
    public string[] Output { get; set; }
  }
}