C# Math Functions / Graphing

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C#

I am trying to create a simple windows form application in visual studio 2010 using C#.

I want to feed the program 5 (x,y) coordinates and based on these points have the program fit a line through them.

For example, if my x values are dollars and my y values represent customer satisfaction, then I will feed the program the following 5 points:


(x,y)

($0,0)
($25000, 0.10)
($50000, 0.25)
($75000, 0.60)
($100000, 1.0)

Based on these points given to the program, I would like the program to create a smooth curve through the points and give me y values that fall between the points above.

In other word, I will ask the program based on the 5 points to now tell me what the satisfaction level is for $60000 which falls between 0.25 and 0.60 as per the table above.

I don't really need a graph to be drawn - just need the correct y value for any x value I ask.

Any help would be greatly appreciated. :)

Thanks,

Hunter