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

Question

I open a file with write permission. But when i want to open again a file with the same name i get an Exception. Here the code:

// Check to see if file was uploaded
            if (FileMdl.PostedFile != null)
            {
                // Get a reference to PostedFile object
                HttpPostedFile myFile = FileMdl.PostedFile;

                // Get size of uploaded file
                int nFileLen = myFile.ContentLength;

                // make sure the size of the file is > 0
                if (nFileLen > 0)
                {
                    // Allocate a buffer for reading of the file
                    byte[] myData = new byte[nFileLen];

                    // Read uploaded file from the Stream
                    myFile.InputStream.Read(myData, 0, nFileLen);

                    // Create a name for the file to store
                    Constantes.strFilenameMdl = Path.GetFileName(myFile.FileName);

                    // Write data into a file
                    WriteToFile(Server.MapPath("Files//" + Constantes.strFilenameMdl), ref myData);
                    myFile.InputStream.Flush();
                    myFile.InputStream.Close();


                }
            }


    private void WriteToFile(string strPath, ref byte[] Buffer)
    {
        // Create a file
        FileStream newFile = new FileStream(strPath, FileMode.Create,FileAccess.ReadWrite,FileShare.ReadWrite);

        // Write data to the file
        newFile.Write(Buffer, 0, Buffer.Length);

        // Close file
        newFile.Flush();
        newFile.Close();
        newFile.Dispose();
    }

Supposedly with Flush or Close or Dispose should work, but not so. Any idea?

Please search this site for the exact error message. You'll find dozens of results, one of which is certainly a solution to your problem. Start with any of the 8 in the 10 related questions to the right of yours. ======>>>>>> [FIleStream can't access the file because it's being used by another process](http://stackoverflow.com/q/13297466/62576) seems particularly appropriate as a starting point. — Ken White, Sep 06 '13 at 22:23

score 0 · Answer 1 · answered Sep 06 '13 at 22:10

Before writing to file have you tried to close previous Stream:

                myFile.InputStream.Flush();
                myFile.InputStream.Close();

              // Write data into a file
                WriteToFile(Server.MapPath("Files//" + Constantes.strFilenameMdl), ref myData);

Huy Nguyen · Answer 2 · 2013-09-06T22:37:47.893

Try to use using statement like this way:

    private void WriteToFile(string strPath, ref byte[] Buffer)
    {
        // Create a file
        using (FileStream newFile = new FileStream(strPath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
        {
            // Write data to the file
            newFile.Write(Buffer, 0, Buffer.Length);
        }
    }

See more at: http://msdn.microsoft.com/en-us/library/vstudio/yh598w02(v=vs.100).aspx

Note: You can also simplify your code by remove the ref key out of input parameter and FileShare.ReadWrite parameter out of FileStream statement like this:

    private void WriteToFile(string strPath, byte[] Buffer)
    {
        // Create a file
        using (FileStream newFile = new FileStream(strPath, FileMode.Create, FileAccess.ReadWrite))
        {
            // Write data to the file
            newFile.Write(Buffer, 0, Buffer.Length);
        }
    }

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

2 Answers2