در اینصورت باید از ajax استفاده کنید

    <input type="file" id="FileUpload1" />  
    <input type="button" id="btnUpload" value="Upload Files" />  
      
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>  
    <script>  
    $(document).ready(function(){  
        $('#btnUpload').click(function () {  
      
            // Checking whether FormData is available in browser  
            if (window.FormData !== undefined) {  
      
                var fileUpload = $("#FileUpload1").get(0);  
                var files = fileUpload.files;  
                  
                // Create FormData object  
                var fileData = new FormData();  
      
                // Looping over all files and add it to FormData object  
                for (var i = 0; i < files.length; i++) {  
                    fileData.append(files[i].name, files[i]);  
                }  
                  
                // Adding one more key to FormData object  
                fileData.append('username', ‘Manas’);  
      
                $.ajax({  
                    url: '/Home/UploadFiles',  
                    type: "POST",  
                    contentType: false, // Not to set any content header  
                    processData: false, // Not to process data  
                    data: fileData,  
                    success: function (result) {  
                        alert(result);  
                    },  
                    error: function (err) {  
                        alert(err.statusText);  
                    }  
                });  
            } else {  
                alert("FormData is not supported.");  
            }  
        });  
    });  
    </script>  

    [HttpPost]  
    public ActionResult UploadFiles()  
    {  
    // Checking no of files injected in Request object  
        if (Request.Files.Count > 0)  
        {  
            try  
            {  
                //  Get all files from Request object  
                HttpFileCollectionBase files = Request.Files;  
                for (int i = 0; i < files.Count; i++)  
                {  
                    //string path = AppDomain.CurrentDomain.BaseDirectory + "Uploads/";  
                    //string filename = Path.GetFileName(Request.Files[i].FileName);  
      
                    HttpPostedFileBase file = files[i];  
                    string fname;  
      
                    // Checking for Internet Explorer  
                    if (Request.Browser.Browser.ToUpper() == "IE" || Request.Browser.Browser.ToUpper() == "INTERNETEXPLORER")  
                    {  
                        string[] testfiles = file.FileName.Split(new char[] { '\\' });  
                        fname = testfiles[testfiles.Length - 1];  
                    }  
                    else  
                    {  
                        fname = file.FileName;  
                    }  
      
                    // Get the complete folder path and store the file inside it.  
                    fname = Path.Combine(Server.MapPath("~/Uploads/"), fname);  
                    file.SaveAs(fname);  
                }  
                // Returns message that successfully uploaded  
                return Json("File Uploaded Successfully!");  
            }  
            catch (Exception ex)  
            {  
                return Json("Error occurred. Error details: " + ex.Message);  
            }  
        }  
        else  
        {  
            return Json("No files selected.");  
        }  
    }  

همینو میخاستم مهندس مهربان