An enhanced version
Status: Alpha
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graphcontrol
I was looking for a simple/primitive Graph object for my C# app and started with your code. I ended up redesigning virtually the entire thing by stepwise refinement of your code. I submit my results, a set of C# files that implement a fairly more capable (VS 2005) .NET control for a simple line graph (see attachment). Just drop a Graph Control on your form, .AddDataSeries to it and then .Add Coord's to the the DataSeries.
Thanks a lot for your sharing.
C# source files for a .NET Graph Control