Generating a line automatically

Question

Can I know solution for my query regarding line, I mean to say that I want to generate a line automatically when a program is running and it is not of a particular length. It's length should goes on increase when the program is running. I tried to use Path class in UI.XAML.SHAPES but it possible only by using xaml code by using <Data /> property. I want to write that code as backend such that it should generate a line automatically. I have gone through with Move and Draw Commands but I am unable to understand. Please suggest any code, sample, or documentation regarding this query so that, it will be very helpful for my project. As I am trying to develop a game targeting windows store applications 8.1 by using C# language.