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

[[gja]]

Hello guys,

I have encounter this exception

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

This is a windows service application.im using filesystemwatcher control to monitor a folder and then my VBA app. drop a CSV file to that folder.it works for the first time you drop a file but if i try to drop another file it will throw an exception.

please any idea.what ive done wrong here.

this is my code

private void folderWatcher_Created(object sender, FileSystemEventArgs e) 
        {
            try
            {
                //Lookup all .csv in the given directory.
                string[] localPath = Directory.GetFiles(@"C:\EG2003\COSBM\", "*.csv");
                
                
                //Get the filename
                string filename = localPath[0].Substring(localPath[0].Length - 7, 7);

                //FilePath where we drop the file in HO.
                String HOPath = string.Concat(@"C:\DTR_Fire\", filename);

                using (testwebserver.COSBMService service = new testwebserver.COSBMService())
                {
                    //service.WriteFile(HOPath, null, string.Empty);

                    using (FileStream fs = new FileStream(localPath[0], FileMode.Open, FileAccess.Read,FileShare.ReadWrite))
                    {
                        if (fs.Length > 0)
                        {
                            byte[] Data;
                            long ByteToRead;

                            while (fs.Position < fs.Length)
                            {
                                if (fs.Length - fs.Position >= 102400)
                                {
                                    ByteToRead = 102400;
                                }
                                else
                                {
                                    ByteToRead = fs.Length - fs.Position;
                                }
                     
                                Data = new byte[ByteToRead];
                                fs.Read(Data, 0, unchecked((int)ByteToRead));
                                service.WriteFile(HOPath, Data, string.Empty);
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                LogMessageToFile(ex.Message);
            }
                
        }

[pukisoft]

Try closing the filestream.

[[gja]]

Try closing the filestream.

i did but i get this error:

Only assignment, call, increment, decrement, and new object expressions can be used as a statement

[techgnome]

Here's the thing I've found about using the FSW looking for newly created files. The even fires off when a file is created... created, but not necessarily finished. huh? eh? wha? Consider this: any process that writes to a file first has to CREATE it before it can be written to. So that's what's happening... the file is being created, but still written to by the other process when you try to access it. this was a problem we ran into in a former life of mine... so what we did was each time the create event was fired, we'd get the file name, and put it into an array (at the time, we didn't have generics, otherwise we'd have used a Queue(Of T)) and start a timer. the timer had a 30-second delay. This usually gave the external process (we were receiving files via FTP) to complete the file transfer. If another file came in during that 30 seconds, the timer was stopped, reset, and restarted, allowing another 30 seconds. When the timer expired, we then took the array and loop through each file in it and process them.

-tg

[MattP]

Yeah, ran into that problem in a previous job before.

Check out this link: http://bloggingabout.net/blogs/jschr.../06/12886.aspx

Here's the solution I came up with in the past: vb dot net forums.com/vb-net-general-discussion/40290-help-file-watcher-class-visual-basic-net.html#post116289 (remove the spaces)

@Mods - Very classy auto renaming the links to the other forum to ***************s.com.

[techgnome]

Matt - the link gets renamed because of some previous bad behavior... it was blacklisted for some reason (I don't remember off hand what the problem was... but it is what it is).

-tg