Your only control handles on the labeling for the xamWebChart are to set the minimum, maximum and unit of the range. So I don't think it would be possible, currently, to implement what you are trying for. I would recommend making a feature request for this functionality.

Vijay,

Could you further explain what you mean by "labels for the 4 months once"? It may help the discussion if we have a reference. How does what you want differ from this simple example that plots 1000 data points on the time axis in a scatter line chart:

<UserControl x:Class="SilverlightApplication14.MainPage"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480"

    xmlns:igChart="clr-namespace:Infragistics.Silverlight.Chart;assembly=Infragistics.Silverlight.DataVisualization.Chart.v9.2">

  <Grid x:Name="LayoutRoot">

        <igChart:XamWebChart x:Name="theChart" >

            <igChart:XamWebChart.Series>

                <igChart:Series ChartType="ScatterLine" DataSource="{Binding}" DataMapping="ValueX = Date; ValueY = Value" />

            </igChart:XamWebChart.Series>

        </igChart:XamWebChart>

    </Grid>

</UserControl>

Code Behind:

public partial class MainPage : UserControl

    {

        public MainPage()

        {

            InitializeComponent();

            DateTime date = DateTime.Now.AddDays(-1000);

            Random rand = new Random();

            ObservableCollection<TestDataItemViewModel> testData =

                new ObservableCollection<TestDataItemViewModel>();

            double last = 3.0;

            for (int i = 0; i < 1000; i++)

            {

                double value = rand.NextDouble() * 2.0;

                double sign = rand.NextDouble();

                if (sign > .5)

                {

                    value = value * -1.0;

                }

                last += value;

                TestDataItemViewModel testItem = new TestDataItemViewModel()

                {

                    Date = date,

                    Value = last

                };

                testData.Add(testItem);

                date = date.AddDays(1);

            }

            DataContext = testData;

        }

    }

    public class TestDataItemViewModel

    {

        public DateTime Date { get; set; }

        public double Value { get; set; }

    }