title: HtmlEncoder error in Asp.Net MVC 5
body: <p>I am getting this error when I compile:
  Error-CS0103 "The name 'HtmlEncode' does not exist in the current context"</p>
  
  <p>I am using Visual Studio 2015 Community edition and MVC.  </p>
  
  <p>The code is:</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Threading.Tasks;
  using Microsoft.AspNet.Mvc;
  
  namespace MvcMovie.Controllers
  {
      public class HelloWorldController : Controller
      {
          // 
          // GET: /HelloWorld/ 
  
          public string Index()
          {
              return "This is my default action...";
          }
  
          // 
          // GET: /HelloWorld/Welcome/ 
  
          public string Welcome(string name, int numTimes = 1)
          {
              return HtmlEncoder.Default.HtmlEncode(
                  "Hello " + name + ", NumTimes is: " + numTimes);
          }
      }
  }
  </code></pre>
  
  <p>I cannot find HtmlEncoder to add to References.<br>
  Can you see what I am doing wrong? </p>
  
  <p>Thanks!</p>