The action can't be completed because the file is open in IIS Worker Process

Question

I am uploading a image for a user & saving it on a specified location. The code is working fine in normal scenario i.e. user selects a image & save it, it works.

Challenge occurs when user selects a image( probably wrong image due to mistake) & don't save it, but again selects a new image & then saves it. This scenario gives me the error :

"The process cannot access the file because it is being used by another process."

When I try to delete image from the location at the time of error, file can't be deleted with message:

"The action can't be completed because the file is open in IIS Worker Process Close the file and try again."

Code is like this:

            try
            {
                if (!Directory.Exists(folder))
                    Directory.CreateDirectory(folder);

                msf = new MemoryStream();
                bytes=FileUpload1.FileBytes;
                msf.Write(bytes, 0, bytes.Length);

                using (FileStream stream = new FileStream(folder + "/" + filename, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
                {
                    //converting any graphic file type to jpeg format
                    Image img = Image.FromStream(msf);
                    img.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);

                    msf.WriteTo(stream);
                    IsuploadSuccess = true;
                    img.Dispose();
                }
            }
            catch
            {
                IsuploadSuccess = false;
            }
            finally
            {
                if (msf != null)
                {
                    msf.Close();
                    msf.Dispose();
                }
            }

I have tried adding "FileAccess.ReadWrite" & "FileShare.ReadWrite" in file stream, but doesn't work either with all options in File stream.

Please help...

Answer 1

Instead of getting solution of problem, I finally change approach to get rid to source of challenge. I change file name with UserID (unique) appended with CurrentDateTime converted to string & store it to temp folder until user save the change. This forms a different file each time for the challenge scenario. After save each file in temp folder created by the user (preceded by unique userid) is deleted & last changes are saved to respective directory.