Difficulty in using timer class in C#

Question

Dear all

I am new to C# and currently i am working on a simulator application to reresent the behaviour of a simple sensor network. I have created a simple windows form on which i placed some ellipse to represent sensor nodes.what i want to do is i want to draw some animated lines between nodes to shw the packet path and trying to use timer class for a delay to refesh the form using Invalidate();
but i cant get it runnig.

Can anyone help me in this.Thanks in advance.