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The vertical grid lines of the chart should match the axis' major ticks, not its labels. If the plot mode of you axis is between ticks the labels will not be drawn under the tick, respectively the wont be aligned with the grid lines. You should use the on ticks plot mode:
xAxis.PlotMode = TKChartAxisPlotMode.OnTicks;
I hope this helps. If you need further assistance I will be glad to help.
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