how to draw a graph between time and speed in c#

First you have to First Calculate the Product of what you want
http://www.gcseguide.co.uk/travel_graphs.htm

and later you can plot. Find Data First and Plot later.

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C# codes for drawing Travel dotted Graph

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These is how Graphs are Plotted
http://www.codeproject.com/KB/miscctrl/quickgraph.aspx

http://www.dotnetspark.com/kb/1371-create-charts-plot-asp-net-using-microsoft.aspx

http://www.c-sharpcorner.com/UploadFile/steve_hall/drawinglinechart02072007053420AM/drawinglinechart.aspx

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Drawing a graph is not actually a big deal, the problem is how you plot the points exactly. You should take the whole section as graph paper with each pixel as its co-ordinates. And then calculate the exact location to plot the point.

There are lots of tutorials available over internet, which might help you while you crate a graph :
http://www.codeguru.com/columns/dotnet/article.php/c6145
or the links provided just above ...

You can also go for some readymade charter controls, which would make your life easier :
http://www.codeproject.com/KB/miscctrl/ChartControl.aspx

http://www.codeproject.com/KB/graphics/zedgraph.aspx

I hope those articles will help you.

Cheers.

www.abhisheksur.com

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There are some free ware softwares available in the following link

http://wareseeker.com/free-graph-speed/

Check whether it helps you

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With regards
Nishithraj Narayanan

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