C#, DataVisualization.Charting: assign custom labels to values on axes

Question

In C# I am using the DataVisualization.Charting library for plotting. In a simple line graph, I would like to show some custom text on the x-axis on positions x=0, 1, 2, 3.

Something like this (in matplotlib, though):

This is the documentation for Axis class, but I'm not sure what I should look for.

Answer 1

Use the AxisLabel property of DataPoint. Description of AxisLabel property:

Gets or sets the text of the X-axis label for the data point, series or an empty point. This property is only used if a custom label has not been specified for the relevant Axis object.

So your code can look like this:

DataPoint dp1 = new DataPoint(1, 1);
dp1.AxisLabel = "Frogs";
DataPoint dp2 = new DataPoint(2, 4);
dp2.AxisLabel = "Hogs";
DataPoint dp3 = new DataPoint(3, 9);
dp3.AxisLabel = "Bogs";
DataPoint dp4 = new DataPoint(4, 6);
dp4.AxisLabel = "Slogs";
chart1.Series[0].Points.Add(dp1);
chart1.Series[0].Points.Add(dp2);
chart1.Series[0].Points.Add(dp3);
chart1.Series[0].Points.Add(dp4);

Or you can enforce 1=Frogs, 2=Hogs, 3=Bogs and 4=Slogs with following code:

chart1.ChartAreas[0].AxisX.MajorGrid.Enabled = false;
chart1.ChartAreas[0].AxisY.MajorGrid.Enabled = false;    
chart1.Series[0].MarkerStyle = MarkerStyle.Circle;
chart1.Series[0].MarkerBorderColor = System.Drawing.Color.Black;
chart1.Series[0].MarkerColor = System.Drawing.Color.Red;
chart1.Series[0].Points.AddXY(1, 1);
chart1.Series[0].Points.AddXY(2, 4);
chart1.Series[0].Points.AddXY(3, 9);
chart1.Series[0].Points.AddXY(4, 6);
foreach (DataPoint dp in chart1.Series[0].Points)
{
    switch ((int)dp.XValue)
    {
        case 1: dp.AxisLabel = "Frogs"; break;
        case 2: dp.AxisLabel = "Hogs"; break;
        case 3: dp.AxisLabel = "Bogs"; break;
        case 4: dp.AxisLabel = "Slogs"; break;
    }
}

To achieve really the same as on the picture - axes on both sides - you would need to use the following trick.

It works for X axis only, for Y axis you can add custom labels as described here.

You can also use labels of datapoints which appear inside the chart using IsValueShownAsLabel.