title: Download file by POST ajax call
body: <p>I have an Asp.Net MVC project and in my View this stretch:</p>
  
  <pre><code>$.ajax({
          beforeSend: function () {
              LoadStart();
          },
          complete: function () {
              LoadStop();
          },
          //async: false,
          contentType: 'application/json, charset=utf-8',
          dataType: 'json',
          type: 'POST',
          url: '@Url.Action("MyAction", "MyController")',
          data: JSON.stringify(
              {
                  Param1: 1,
                  Param2: 2
              }),
          success: function (data) {
              $("#pdf-content").show();
              // Here, fill DIV (pdf-content) with PDF.
          },
          fail: function () {
              alert("Fail");
          }
  });
  </code></pre>
  
  <p><br/>
  In <code>MyAction</code>, I have:</p>
  
  <pre><code>[HttpPost]
  public ActionResult MyAction(int Param1, int Param2)
  {
      // Code ...
  
      MemoryStream stream = new MemoryStream();
      outPdf.Save(stream);
      byte[] fileContents = stream.ToArray();
  
      return File(fileContents, "application/pdf", "myFile.pdf");
  }
  </code></pre>
  
  <p><br/>
  How can I display the PDF in DIV, or even download directly without displaying?</p>