When the horizontal axis is crowded with axis labels, you need to rotate the labels to avoid the cluttered look. Rotating the labels allows you to accommodate a large number of labels in a limited space on the axis.

You can use the LabelAngle property to rotate axes labels in anticlockwise direction in FlexChart.

See the code given below for reference.

<Chart:C1FlexChart.AxisX>
    <Chart:Axis LabelAngle="45" Reversed="True" MajorGrid="True" MajorTickMarks="Inside" Title="Fruits"
     AxisLine="True" Position="Bottom"></Chart:Axis>
</Chart:C1FlexChart.AxisX>