Problem in Tray Pop Up (C#)

Hello everyone,
I'm creating program for File Monitoring using "FileSystemWatcher" class (Winforms C#).
The purpose is for notifying user with message box whenever there was some folder/file creation,
then i tried to use tray pop up for display the message, (i downloaded from http://www.codeproject.com/useritems/adsstraypopup.asp).
But the Tray Pop up won't run when was called in my File Monitoring program. (I separated those 2 files - Tray Popup & Filewatcher)

These are snippets of my programs
public void OnCreated(object ob, FileSystemEventArgs arg)
{
//showTrayPopUp(arg.FullPath + " Created"); --> doesn't work
MessageBox.Show(arg.FullPath + " Created");
}
private void showTrayPopUp(string msgStr)
{
popUpWnd1.Width = Convert.ToInt32(300);
popUpWnd1.Height = Convert.ToInt32(80);
popUpWnd1.opacity = Convert.ToInt32(75);
popUpWnd1.BottomColor = Color.LightSkyBlue;
popUpWnd1.TopColor = Color.DodgerBlue;
popUpWnd1.ShowWindow(msgStr, "Information");
}

My Questions are:
1. Why does it happen In case I used message box for displaying a message when method onCreated triggered it was run,
but if i changed by showing TrayPopUp it wasn't.

2. How can we know about the owner of file (using C#)