Problem with origin and gradient in Visual C# Charts

Question

I am new to C# and using chart. All I want is to make a chart,
say i have 2 data points, (0,0) and (1,1)
I want my chart have gradient of 1 and origin in 0,0
i have tried it, and this is what i got

what should i do, to make 0-1  x-axis scale = y axis scale so the gradient would be 1
and how to prevent zero point of x-axis don't shift anywhere
(zero-point of x-axis meet/cross with zero-point of y-axis)

[URL=http://imageshack.us/photo/my-images/546/11618702.jpg/][IMG=http://img546.imageshack.us/img546/89/11618702.jpg][/IMG][/URL]

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sorry for my english and ignorance
thanks in advance