The following example modifies the code you posted to show how to explicitly assign DataPoints for the specific data. Also, I added the code to explicitly assign the data for each column in each row (the shortcut syntax you posted did not compile for me).

private void LoadChart1()
{
    DataTable dt = new DataTable();
    dt.Columns.Add("Series Label", typeof(string));
    dt.Columns.Add("Segment A", typeof(int));
    dt.Columns.Add("Segment B", typeof(int));
    dt.Columns.Add("Segment C", typeof(int));
    dt.Columns.Add("Segment D", typeof(int));

    DataRow row = dt.NewRow();
    row["Series Label"] = "Stack A";
    row["Segment A"] = "1";
    row["Segment B"] = "2";
    row["Segment C"] = "5";
    row["Segment D"] = "200";
    dt.Rows.Add(row);

    row = dt.NewRow();
    row["Series Label"] = "Stack B";
    row["Segment A"] = "2";
    row["Segment B"] = "140";
    row["Segment C"] = "4";
    row["Segment D"] = "2";
    dt.Rows.Add(row);

    row = dt.NewRow();
    row["Series Label"] = "Stack C";
    row["Segment A"] = "5";
    row["Segment B"] = "10";
    row["Segment C"] = "9";
    row["Segment D"] = "15";
    dt.Rows.Add(row);

    row = dt.NewRow();
    row["Series Label"] = "Stack D";
    row["Segment A"] = "3";
    row["Segment B"] = "5";
    row["Segment C"] = "5";
    row["Segment D"] = "7";
    dt.Rows.Add(row);

    xamChart1.Series.Clear();

    for (int i = 0; i < 4; i++)
    {
        Series c = new Series();
        c.ChartType = ChartType.Stacked100Bar;
        c.Label = (string)dt.Rows[i]["Series Label"];

        DataPoint dataPoint = new DataPoint();
        dataPoint.Value = (int)dt.Rows[i]["Segment A"];
        dataPoint.Label = "Segment A";
        c.DataPoints.Add(dataPoint);

        dataPoint = new DataPoint();
        dataPoint.Value = (int)dt.Rows[i]["Segment B"];
        dataPoint.Label = "Segment B";
        c.DataPoints.Add(dataPoint);

        dataPoint = new DataPoint();
        dataPoint.Value = (int)dt.Rows[i]["Segment C"];
        dataPoint.Label = "Segment C";
        c.DataPoints.Add(dataPoint);

        dataPoint = new DataPoint();
        dataPoint.Value = (int)dt.Rows[i]["Segment D"];
        dataPoint.Label = "Segment D";
        c.DataPoints.Add(dataPoint);

        xamChart1.Series.Add(c);

    }
}

The advantage to this last approach is that as long as you can map to the different parts of the data, you can simply assign the data table to the XamChart and specify the Series and mappings in the XAML itself.

Are there any recommended ways of binding data to the XamChart? If you have any code snippets for various chart types and methods of binding it to the xamchart, that will be very helpful.

Check out the documentation for the XamChart. It comes with various samples. The fastest data source would probably be an ObservableCollection of data with a DataMapping assigned.

If you need more samples, I would be happy to post one here.

In WinChart you don't need to specify the DataMapping,  just need 

dataSource = dataTable.DefaultView. 

winChart will combine Seg A, Seg B,  Seg C and Seg D automatically.  So I don't need to know the column names in advanced, this feature is very useful for a dynamic query.   

But in WPF you have to specify column names,  How stupid it is!
How can I create a chart based on a dynamic query?