The process cannot access the file (path) because it is being used by another process

[Kirun]

I have a form with multiple FileUpload (around 8) and then i want to attach these uplaoded files to a message. The uplaoded files would be only images and i need to do some resizing of the image and for which i amusing a control aspJPEG. I am using below code and it works fine with IE but as soon as i try this code on another browser on MAC ,it gives me an error and some times on IE too


The process cannot access the file (path) because it is being used by another process.

how can i get away from this error. I am disposing object as well ,but please can some one check and see whats the matter ,or i have disposed objects at wrong place or i am missing some thing

any help would be appriciated. I am using Visual web developer 2010 with .net 4.0

if some body want to try it LIVE its here: http://www.taylorus.com/buyusedequip/


thanks

 HttpFileCollection UploadFileCol = Request.Files;
            for (int i = 0; i < UploadFileCol.Count; i++)
            {
                HttpPostedFile file = UploadFileCol[i];
                if (file.ContentLength > 0)
                    {
                        strFileName = Path.GetFileName(file.FileName);
               fullyqualifidespath = Server.MapPath("~/uploads/" + strFileName);
                                          
                       file.SaveAs(fullyqualifidespath);

                       file.InputStream.Dispose();

                       ASPJPEGLib.IASPJpeg objJpeg;
                       objJpeg = new ASPJPEGLib.ASPJpeg();

                       // Open source image

                       objJpeg.Open(fullyqualifidespath);

                       if (objJpeg.OriginalWidth > objJpeg.OriginalHeight)
                       {
                           objJpeg.Width = 400;
                                              objJpeg.Height = objJpeg.OriginalHeight * objJpeg.Width / objJpeg.OriginalWidth;

                       }

                       if (objJpeg.OriginalWidth < objJpeg.OriginalHeight)
                       {
                           objJpeg.Width = 300;
                           objJpeg.Height = objJpeg.OriginalHeight * objJpeg.Width / objJpeg.OriginalWidth;

                       }

                        objJpeg.Save(fullyqualifidespath);

                        objJpeg.Close();

       msg.Attachments.Add(new Attachment(fullyqualifidespath));
                       
                    }

                }
              

    SmtpClient client = new SmtpClient("someserver.net", 25);
      
            client.Credentials = CredentialCache.DefaultNetworkCredentials;
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.Send(msg); 
            msg.Attachments.Dispose(); 
            msg.Dispose();
            Response.Redirect("thankyou.aspx");

[tr333]

I haven't checked the code, but going by the error message it sounds like concurrency problems with two things attempting to access the file at the same time. Windows will place a lock on a file when process1 accesses it and prevent process2 from writing to that file (modifying it). The solution would be to try and find where/when two different processes are trying to access the same file at the same time.

[brin351]

You can get these errors when saving a file and imediately trying to modify it. Even though you may dispose of everything I've noticed this can occure from time to time. The time interval between a few lines of code running are very small and IO/file conflicts in saving then opening a file

The way I work with uploaded images straight away is to create the image object from the fileUploadStream, no need to save it to disk, change it, save it elsewhere, and delete the redundant file.

I looked at ASPJPEGLib and it may be possible see here

http://www.aspjpeg.com/manual_02.html#2_3