Action did nt Trigger in the partial class!

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C#

MVC

I want to upload a image to the system, but in the view action is not triggering instead of that it is called index() action in the same controller (HOmeController)

In the View :

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<BL7HRIS.Models.ImageModal>" %>

<script src="<%: Url.Content("~/Scripts/jquery-1.7.1.min.js") %>"></script>
<script src="<%: Url.Content("~/Scripts/jquery.validate.min.js") %>"></script>
<script src="<%: Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js") %>"></script>

<% using (Html.BeginForm("Upload","Home", FormMethod.Post))
   { %>
    <%: Html.ValidationSummary(true) %>
        <div>
                    <input name="ImageUploaded" type="file">
                    <input type="submit">
                   <%:ViewBag.path2%>
                    &nbsp;</p>
       </div>
<% } %>

<div>
    <%: Html.ActionLink("Back to List", "Index") %>
</div>
<p>
    <img src="Content/Images/Full/<%=ViewBag.path2%>.jpg" alt="No IMAGE UPLOADED" width="304" height="228" /></p>

In the Controller

public ActionResult Index()                     
                    //for image uploader

                      if (fileName != "")
                        {
                            ViewBag.path2 = fileName;
                            fileName = "";
                        }
                        else
                        {

                            ViewBag.path2 = "No IMAGE!";
                        }
                        //return View("Index");                    
                    }

                  //image uploader 

            return View();
        }

// upload method is here

        [HttpPost]
        public ActionResult Upload(ImageModal model)
        {
            if (ModelState.IsValid)
            {
                // string fileName = Guid.NewGuid().ToString();
                string fileName = "A00001";
                fileName = "A00001";
                string serverPath = Server.MapPath("~");
                string imagesPath = serverPath + "Content\\empImages\\";

                string thumbPath = imagesPath + "Thumb\\";
                string fullPath = imagesPath + "Full\\";
                ImageModal.ResizeAndSave(thumbPath, fileName, model.ImageUploaded.InputStream, 80, true);
                ImageModal.ResizeAndSave(fullPath, fileName, model.ImageUploaded.InputStream, 600, true);

anyone have any suggestions? Thanks a lot ? Note this is a partial class and i call this partial class from another view called index :)
            }
            return RedirectToAction("Index");
        }  
        //---------added by heshan for image uploader----//
    }