UploadedBytes wrong value

[creatorness]

Hello,
I have a small problem and do not know if this is my mistake or a bug.
I use the SftpClient to upload a file. For this I use BeginUploadFile with Filestream.
In the end I check with uploadhandler.UploadedBytes if the file was uploaded correctly.
But there always comes a different result out and only occasionally the right number.
Here is the simplified code:

SftpClient client = new SftpClient(host, port, user, password);
client.Connect();
FileStream fileStream =  new FileStream(source, FileMode.Open);
SftpUploadAsyncResult uploadhandler = client.BeginUploadFile(fileStream, target, null, null) as SftpUploadAsyncResult;

                        while (!uploadhandler.IsCompleted)
                        {
                                Thread.Sleep(500);

                        }
                        client.EndUploadFile(uploadhandler);
                        FileInfo fi = new FileInfo(source);
                        if (uploadhandler.UploadedBytes == Convert.ToUInt64(fi.Length))
                        {
                            return true;
                        } else {
                            return false
                        }

[Kizmar]

We also noticed the value returned in the UploadedBytes property wasn't reliable. I was hoping to use it to determine if an upload was successful, but we resorted to using Exists() instead.

Example:

client.BeginUploadFile(stream, path, true, result =>
{
    try
    {
        var exists = client.Exists(path);
        tcs.TrySetResult(exists);
    }
    catch (Exception e)
    {
        tcs.TrySetException(e);
    }
}, null);