Question

I am using this code to write asynchronously to a file

    public static void AsyncWrite(string file, string text)
    {
        try
        {
            byte[] data = Encoding.Unicode.GetBytes(text);                

            using ( FileStream fs = new FileStream(file, FileMode.Create,
                FileAccess.Write, FileShare.Read, 1, true))                                         
                    fs.BeginWrite(data, 0, data.Length, null, null);
        }            
        catch
        {

        }            
    }

For some reason, from time to time, rather than writing text into the file as expected, Notepad++ shows the following ouput :

Answer 1

BeginWrite is asynchronous, so it might well happen that the stream is closed through the using statement while other things are happening.

I’d not use using when doing asynchronous writing. Instead I’d create a proper callback method and close the stream there. This would also give you the chance to call EndWrite as recommended.