Sample project plugin jquery File Upload plugin implemented in ASP .NET MVC3

Did you read the documentation of the plugin that you are trying to use? Did you try the basic plugin functionality? Did you try to create a new ASP.NET MVC 3 application in Visual Studio using the default template?

Did you try writing a simple controller:

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Index(IEnumerable<HttpPostedFileBase> files)
    {
        foreach (var file in files)
        {
            var filename = Path.Combine(Server.MapPath("~/App_Data"), file.FileName);
            file.SaveAs(filename);
        }
        return Json(files.Select(x => new { name = x.FileName }));
    }
}

and a corresponding view:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="@Url.Content("~/Scripts/blueimp/js/vendor/jquery.ui.widget.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/blueimp/js/jquery.iframe-transport.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/blueimp/js/jquery.fileupload.js")" type="text/javascript"></script>

<script type="text/javascript">
    $(function () {
        $('#fileupload').fileupload({
            dataType: 'json',
            url: '@Url.Action("index")',
            done: function (e, data) {
                $.each(data.result, function (index, file) {
                    $('<p/>').text(file.name).appendTo(document.body);
                });
            } 
        });
    });
</script>

<input id="fileupload" type="file" name="files" multiple="multiple"/>

If you haven't, I invite you to do so.