title: jQuery ajax upload file in asp.net mvc
body: <p>I have a file in my view</p>
  
  <pre><code>&lt;form id="upload" enctype="multipart/form-data"&gt;
     &lt;input type="file" name="fileUpload" id="fileUpload" size="23" /&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>and an ajax request</p>
  
  <pre><code>$.ajax({
      url: '&lt;%=Url.Action("JsonSave","Survey")  %&gt;',
      dataType: 'json',
      processData: false,
      contentType: "multipart/mixed",
      data: {
          Id: selectedRow.Id,
          Value: 'some date was added by the user here :))'
      },
      cache: false,
      success: function (data) {}
  });
  </code></pre>
  
  <p>but there is no file in the <strong>Request.Files</strong>. Whats wrong with the ajax request?</p>