plotting graphs in C#

If you search this site for chart or line chart, you will find many articles on it.

Here are some resources:

Drawing Line Chart in ASP.NET by Steve Hall on Feb 07, 2007

2D Charting by paul on Dec 26, 2005
I was amazed at what the VS.NET IDE does for a programmer as I was primarily used to Java via the command line.

Charting in GDI+ by John O Donnell on Dec 26, 2005
Here is an example of creating simple charts using GDI+ commands in C#. I have used the random class to create 5 random percentage values. I then use GDI+ to plot these values on a chart.