Printing the last added line to log file

public void Progress_Log(SchemaUpdate imp)
{
    // Preparing remote mapping
    string strCmdText;
    strCmdText = "/C net use /delete k: /y";
    System.Diagnostics.Process.Start("CMD.exe", strCmdText);
    Thread.Sleep(500);
    strCmdText = @"/C net use K: \\xx\e$\test\dumps\Create /user:xx xxxx";
    System.Diagnostics.Process.Start("CMD.exe", strCmdText);
    var watch = new FileSystemWatcher
    {
        Path = @"\\TN1ORC21\e$\test\dumps\Create",
        Filter = "output.txt"
    };
    //watch.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite; //more options
    watch.Changed += new FileSystemEventHandler(OnChanged);
    watch.EnableRaisingEvents = true;
}

public void OnChanged(object source, FileSystemEventArgs e)
{
    using StreamReader r = new StreamReader(System.IO.File.Open(@"k:\" + e.Name, FileMode.Open, FileAccess.Read, FileShare.ReadWrite));
    string line;
    while (!r.EndOfStream)
    {
        line = r.ReadLine();
        if (r.Peek() == -1)
        {
            HubContext.Clients.All.SendAsync("ReceiveMessage", "Log", line);
            // THIS BASICALLY SENDS THE LINE TO THE HUB THEN TO THE CLIENT (BROWSER)
        }
    }
}