Thanks Dominique,
It helps to plot point on line with specific interval.
But another question is how to get segment of polyline using silverlight api? Because polyline.Paths provides collection of points.I need starting and ending point of each segment.
Is there any way to get segments of polyline?
I am not sure to understand what you mean.
The collection of points gives directly you the starting and ending point of each segment.
If you want to create segments from the M starting and ending positions, the Linear referencing sample should help