@{
    ViewBag.Title = "uploadFolder";
}


upload Folder
​

        public ActionResult uploadFolder()
        {
            return View();
        }

        [HttpPost]
        public async Task UploadHomeReport()
        {
            try
            {
                foreach (string file in Request.Files)
                {
                    var fileContent = Request.Files[file];
                    if (fileContent != null && fileContent.ContentLength > 0)
                    {
                        // get a stream
                        var stream = fileContent.InputStream;
                        // and optionally write the file to disk
                        var fileName = fileContent.FileName;
                        fileName = fileName.Replace(@"/",@"\");
                        string[] arr = fileName.Split('\\');
                        //\tculms\sub\sub1
                        var tempPath = string.Empty;
                        for (int i = 0; i < arr.Length; i++) {
                            if (!isFolder(arr[i]))
                            {
                                var targetPath = string.Empty;
                                if (i == 0)
                                {
                                    targetPath = Path.Combine(Server.MapPath("~/Images"), arr[i]);
                                    tempPath = tempPath + "\\" + arr[i];
                                    if (!System.IO.Directory.Exists(targetPath))
                                    {
                                        System.IO.Directory.CreateDirectory(targetPath);
                                    }
                                }
                                else
                                {
                                    tempPath = tempPath + "\\" + arr[i];
                                    targetPath = Server.MapPath("~/Images") + tempPath;
                                    //targetPath = Path.Combine(Server.MapPath("~/Images"), tempPath);
                                   
                                    if (!System.IO.Directory.Exists(targetPath))
                                    {
                                        System.IO.Directory.CreateDirectory(targetPath);
                                    }
                                }
                                
                            }
                        }
                        var path = Path.Combine(Server.MapPath("~/Images"), fileName);
                        using (var fileStream = System.IO.File.Create(path))
                        {
                            stream.CopyTo(fileStream);
                        }
                    }
                }
            }
            catch (Exception)
            {
                Response.StatusCode = (int)HttpStatusCode.BadRequest;
                return Json("Upload failed");
            }

            return Json("File uploaded successfully");
        }

        private bool isFolder(string txt) {
            var arr = txt.ToCharArray();
            for (int i = 0; i < arr.Length;i++ )
            {
                if (arr[i] == '.') {
                    return true;
                }
            }
            return false;
        }

https://cmatskas.com/upload-files-in-asp-net-mvc-with-javascript-and-c/

http://stackoverflow.com/questions/3853767/maximum-request-length-exceeded

http://stackoverflow.com/questions/20429960/file-upload-and-knowing-the-directory-structure