protected void fileUploaded(object sender, FileUploadedEventArgs e)
        {
            try
            {
                if (RadAsyncUpload1.UploadedFiles.Count > 0)
                {
                    if (targetPersonalTmpFolder.Exists.Equals(false)) targetPersonalTmpFolder.Create();

                    foreach (UploadedFile uploadedFile in RadAsyncUpload1.UploadedFiles)
                    {
                        //UploadedFileInfo uploadedFileInfo = new UploadedFileInfo(uploadedFile);

                        string fullPath = Path.Combine(targetPersonalTmpFolder.ToString(), uploadedFile.GetName());
                        uploadedFile.SaveAs(fullPath, true);
                       
                        TmpFiles_List.Add(new UplodedFileData()
                        {
                            FileName = uploadedFile.GetName(),
                            FullFileName = targetPersonalTmpFolder.ToString() + @"\" + uploadedFile.GetName(),
                            //FileContentLength = Math.Round(uploadedFile.InputStream.Length / 1024d, 0).ToString() + " KB"
                            FileContentLength = Math.Round(uploadedFile.ContentLength / 1024d, 0).ToString() + " KB"
                        });
                       
                    }

                    BindFiles();
                    BindTmpFiles();
                }
            }
            catch (Exception ex)
            {
                //Pravdepodobne bol stlaceny klaves F5 refresh stranky...
                ReinitializeForm();
            }
        }

--------------------------------------------------------------------------------------------
The problem is that property uploadedFile.ContentLength doesn't return real length of the file. I've found that this uploadedFile.InputStream.Length returns correct file size, but when I tried to use it, then this error appeared: The process cannot access the file because it is being used by another process...

Something similar is described here: http://www.telerik.com/community/forums/aspnet-ajax/async-upload/temporary-files-locked-after-upload.aspx

For further information you can check the attachment.

Please help me to solve this issue...

Best regards Vasssek