Process Monitor

[DumbAndDumber]

Hey
So I got this idea to write a very small application for a school project that raises a balloon from the system tray everytime a new process is getting launched or an existing process quits.

With my current code, I am getting the list of processes using a timer.

This list needs to be compared with the previous list and detect differences (if this is possible, or should I use a different concept)? I have no clue how to do this.

I currently have:
-A ListView (ListView1), with the View property to "Details"
-A Timer (at a 5000ms interval), with the following code:

        Dim processList() As Process
        processList = Process.GetProcesses()
        For Each proc As Process In processList
            Dim Item As New ListViewItem
            Item.Text = proc.Id.ToString
            Item.SubItems.Add(proc.ProcessName.ToString)
            Item.SubItems.Add(proc.Responding.ToString)
            ListView1.Items.Add(Item)
        Next

Anyone can help me out with the comparison part?

tl;dr: Need some help with a piece of code to notify the user if a new process started or an existing process quit.