public override void OnActionExecuting(ActionExecutingContext filterContext)
		{
			var uploadResult = new ChunkUploadResult(); 

			string path = null;
			try
			{
				if (filterContext.HttpContext.Request.Files.Count > 0)
				{
					var sseq = filterContext.HttpContext.Request["Sequence"];
					var seq = ChunkSequence.Body;
					if (!string.IsNullOrEmpty(sseq))
						System.Enum.TryParse<ChunkSequence>(sseq, out seq);

					var post = new ChunkInfo() { Sequence = seq, Hash = filterContext.HttpContext.Request["Hash"], Filename = filterContext.HttpContext.Request["Filename"]  };
					var postedFile = filterContext.HttpContext.Request.Files[0];
					path = filterContext.HttpContext.Server.MapPath("~/App_Data/" + postedFile.FileName); //using filename as the identifier (GUID)
					AppendPostedFileContent(postedFile, path);

					uploadResult.ContentType = postedFile.ContentType;
					uploadResult.TempFilePath = path;
					
					if (post.Sequence == ChunkSequence.End)
					{
						//validate full file hash. 
						string hash = null;
						using (var fs = System.IO.File.OpenRead(path))
							hash = Utility.GetHashSHA1(fs);

						if (hash == post.Hash)
						{
							uploadResult.Success = true;
							uploadResult.FileUploadComplete = true;
							uploadResult.OriginalFilename = post.Filename;
						}
						else
						{
							//fail...resend.
							System.IO.File.Delete(path); //cleanup
							uploadResult.Success = false;
							uploadResult.Message = "Hash fail";

						}
					}
					else
						uploadResult.Success = true;
				}
			}
			catch (Exception ex)
			{
				try
				{
					if (System.IO.File.Exists(path))
						System.IO.File.Delete(path);
				}
				catch { } //swallow it. if it's write permissions, we already know about it. this is just an attempt to cleanup.

				uploadResult.Success = false;
				uploadResult.Message = ex.Message;
			}

			filterContext.ActionParameters["result"] = uploadResult;

			base.OnActionExecuting(filterContext);
		}
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var uploadResult = new ChunkUploadResult();

            string path = null;

            try
            {
                if (filterContext.HttpContext.Request.Files.Count > 0)
                {
                    var sseq = filterContext.HttpContext.Request["Sequence"];
                    var seq  = ChunkSequence.Body;
                    if (!string.IsNullOrEmpty(sseq))
                    {
                        System.Enum.TryParse <ChunkSequence>(sseq, out seq);
                    }

                    var post = new ChunkInfo()
                    {
                        Sequence = seq, Hash = filterContext.HttpContext.Request["Hash"], Filename = filterContext.HttpContext.Request["Filename"]
                    };
                    var postedFile = filterContext.HttpContext.Request.Files[0];
                    path = filterContext.HttpContext.Server.MapPath("~/App_Data/" + postedFile.FileName);                     //using filename as the identifier (GUID)
                    AppendPostedFileContent(postedFile, path);

                    uploadResult.ContentType  = postedFile.ContentType;
                    uploadResult.TempFilePath = path;

                    if (post.Sequence == ChunkSequence.End)
                    {
                        //validate full file hash.
                        string hash = null;
                        using (var fs = System.IO.File.OpenRead(path))
                            hash = Utility.GetHashSHA1(fs);

                        if (hash == post.Hash)
                        {
                            uploadResult.Success            = true;
                            uploadResult.FileUploadComplete = true;
                            uploadResult.OriginalFilename   = post.Filename;
                        }
                        else
                        {
                            //fail...resend.
                            System.IO.File.Delete(path);                             //cleanup
                            uploadResult.Success = false;
                            uploadResult.Message = "Hash fail";
                        }
                    }
                    else
                    {
                        uploadResult.Success = true;
                    }
                }
            }
            catch (Exception ex)
            {
                try
                {
                    if (System.IO.File.Exists(path))
                    {
                        System.IO.File.Delete(path);
                    }
                }
                catch { }                 //swallow it. if it's write permissions, we already know about it. this is just an attempt to cleanup.

                uploadResult.Success = false;
                uploadResult.Message = ex.Message;
            }

            filterContext.ActionParameters["result"] = uploadResult;

            base.OnActionExecuting(filterContext);
        }