public async void InitiateFileUploading()
        {
           
           StorageFolder picturesFolder = KnownFolders.DocumentsLibrary;
         
           //string path = Windows.Storage.ApplicationData.Current.LocalFolder.Path;
           //string PhotoPath = path.Substring(0, path.IndexOf("AppData")) + picturesFolder.Name;

            //Windows.Storage.StorageFolder store;
            //FileOpenPicker openPicker = new FileOpenPicker();
            //openPicker.ViewMode = PickerViewMode.Thumbnail;
            ////openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            //openPicker.FileTypeFilter.Add(".jpg");
            //openPicker.FileTypeFilter.Add(".jpeg");
            //openPicker.FileTypeFilter.Add(".png");

            //StorageFile f = await openPicker.PickSingleFileAsync();
           // IReadOnlyList<StorageFile> files = await Windows.Storage.ApplicationData.Current.LocalFolder.GetFilesAsync();
            Windows.Storage.StorageFolder store=await Windows.Storage.ApplicationData.Current.RoamingFolder.GetFolderAsync("Upload");
          // Windows.Storage.StorageFolder store = await StorageFolder.GetFolderFromPathAsync(@"c:\Carl");
            IReadOnlyList<StorageFile> files = await store.GetFilesAsync();

           // string[] filePaths = System.IO.Path.GetFiles(@"c:\MyDir\");

           //progressbar1.Value = 30;
           // IReadOnlyList<StorageFile> files = await picturesFolder.GetFilesAsync();
           // IReadOnlyList<StorageFolder> fol =await picturesFolder.GetFoldersAsync();
            //string bucketname = "TestingUploadS3";
            List<FileUploadCompleted> listUploadFiles = new List<FileUploadCompleted>();
            FileUploadCompleted uploadfile;
           // var storage = new Setting<List<FileUploadCompleted>>();

           //await storage.SaveAsync("Statistics", null);
            foreach (var file in files)
            {
                uploadfile = new FileUploadCompleted();
                   // progressbar1.Value = 0;
                   // AmazonFileBucketTransferUtil uploadTG = new AmazonFileBucketTransferUtil(bucketname, "key" + Guid.NewGuid().ToString(), file.Path);

                    uploadfile.UploadStartTime = DateTime.Now;
                    uploadfile.Name = file.Name;
                    uploadfile.Url = "https://s3-us-east-1.amazonaws.com/"+ExistingBucketName+"/" + file.Name;
                    //try
                    //{
                    //    System.IO.FileInfo f = new FileInfo(file.Path);
                    //    uploadfile.size=f.Length;
                    //}
                    //catch { }
                //uploadfile.size=file.
                   // currentfile.Text = "Currently Uploading file: " + file.Name;
                    await UploadFile(file.Name, file);
                    uploadfile.UploadEndtime = DateTime.Now;
                    listUploadFiles.Add(uploadfile);
                    //await UpdateRDS(uploadfile,patientobj);
                  // await storage.SaveAsync("Statistics", listUploadFiles);
                    //progressbar1.Value = .currentStatus;                       
            }                    
          // currentfile.Text = "All files are successfully uploaded";
          // notify.Text = "";
        //   await storage.SaveAsync("Statistics", listUploadFiles);
        }
        //public async Task  UploadFileAsync(string name, IStorageFile storageFile, FileUploadCompleted fileinfo)
        //{
        //   await  Task.Factory.StartNew(() => UploadFile( name,  storageFile,  fileinfo));

        //}

        public async void UploadFile(string name, IStorageFile storageFile, FileUploadCompleted fileinfo)
        {
            fileinfo.UploadStartTime = DateTime.Now;
            BasicAWSCredentials credentials = new BasicAWSCredentials("AKIAJTADDHY7T7GZXX5Q", "n4xV5B25mt7e6br84H2G9SXBx8eDYTQJgCxoaF49");
            var s3Client = new AmazonS3Client(credentials, RegionEndpoint.USEast1);
            var transferUtilityConfig = new TransferUtilityConfig
            {
                ConcurrentServiceRequests = 5,
                MinSizeBeforePartUpload = 20 * MB_SIZE,
            };
            try
            {
                using (var transferUtility = new TransferUtility(s3Client, transferUtilityConfig))
                {
                    var uploadRequest = new TransferUtilityUploadRequest
                    {
                        BucketName = ExistingBucketName,
                        Key = name,
                        StorageFile = storageFile,
                        // Set size of each part for multipart upload to 10 MB
                        PartSize = 10 * MB_SIZE,
                        CannedACL = S3CannedACL.PublicRead                       
                    };
                   
                    uploadRequest.UploadProgressEvent += OnUploadProgressEvent;
                   // fileinfo.Status = currentStatus.ToString();
                    try
                    {
                        await transferUtility.UploadAsync(uploadRequest);
                    }
                    catch
                    {

                    }
                   // fileinfo.UploadEndtime = DateTime.Now;
                }
            }
            catch (AmazonS3Exception amazonS3Exception)
            {
                if (amazonS3Exception.ErrorCode != null &&
                    (amazonS3Exception.ErrorCode.Equals("InvalidAccessKeyId")
                    ||
                    amazonS3Exception.ErrorCode.Equals("InvalidSecurity")))
                {
                //    Console.WriteLine("Check the provided AWS Credentials.");
                //    Console.WriteLine(
                //        "For service sign up go to http://aws.amazon.com/s3");
                }
                else
                {
                    //Console.WriteLine(
                    //    "Error occurred. Message:'{0}' when writing an object"
                    //    , amazonS3Exception.Message);
                }
            }
        }