New Post: OxyPlot paint Exception : XAxis not defined

Thanks for your suggestion! I finally fixed the bug. What I did is every time I plot the data set, I create a new model and add all the lines to the model. Then I assign it to PlotView. I'm guessing I should not add line separately? This will require extra work because each time a new line is added, I need to plot old ones together. But I guess it's just linear time so I'll leave it like that.
I'll try the Linq! It looks very handy.

Thanks again!