Labels

The axes of the RadChart display a label for each of the major ticks

You can specify custom Axis Items Labels by either specifying a XCategory or by manually setting TickPoint's labels.

XCategory is used when the data is not sequential, i.e. values on the X Axis have no meaning, for examle when the chart presents information for different companies (whose names are placed on the X axis) or other entities. In case X value is present in the data, and something else should be placed on the X axis, you need to go through the RadChart.DefaultView.ChartArea.AxisX.TickPoints collection and set Label for each TickPoint. Since the XCategory is already described in another help article - Categorical Charts this topic will demonstrate the second approach:

DataSeries lineSeries = new DataSeries(); 
lineSeries.LegendLabel = "Monthly Sales"; 
lineSeries.Definition = new LineSeriesDefinition(); 
Random r = new Random(); 
for (int i = 0; i < 12; i++) 
{ 
    lineSeries.Add(new DataPoint() { YValue = i + r.Next(0, 20) }); 
} 
 
this.radChart.DefaultView.ChartArea.DataSeries.Add(lineSeries); 
 
string[] months = new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", }; 
 
for (int i = 0; i < months.Length; i++) 
{ 
    this.radChart.DefaultView.ChartArea.AxisX.TickPoints[i].Label = months[i]; 
} 

Dim lineSeries As New DataSeries() 
lineSeries.LegendLabel = "Monthly Sales" 
lineSeries.Definition = New LineSeriesDefinition() 
Dim r As New Random() 
For i As Integer = 0 To 11 
    lineSeries.Add(New DataPoint() With { _ 
     .YValue = i + r.Next _ 
    }) 
Next 
radChart.DefaultView.ChartArea.DataSeries.Add(lineSeries) 
Dim months As String() = New String() {"Jan", "Feb", "Mar", "Apr", "May", "Jun", _ 
 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"} 
For i As Integer = 0 To months.Length - 1 
    radChart.DefaultView.ChartArea.AxisX.TickPoints(i).Label = months(i) 
Next 

The result is: