Excel Chart - Data plotted on both Axis

I am trying to plot data on both the X & Y. Right now I have the data being plotted on the Y with the X being the ctr/index. I want the X to have data on it as well. Here is my C# code.

Code:

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Excel.ChartObjects charts = (Excel.ChartObjects)excelWs.ChartObjects(Type.Missing);

Excel.ChartObject chartObj = charts.Add(5, 45, 400, 300);
Excel.Chart chart = chartObj.Chart;

Excel.Range chartRange = excelWs.get_Range("C32", "C40");
chart.SetSourceData(chartRange, Type.Missing);

chart.ChartType = Excel.XlChartType.xlXYScatter;
chart.Legend.Delete();
           
Excel.SeriesCollection seriesCollection = (Excel.SeriesCollection)chart.SeriesCollection(Type.Missing);
Excel.Series series = seriesCollection.Item(seriesCollection.Count);

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I can get this to work in a xls macro. Here is the code for what I want in vba.

Code:

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    Charts.Add
    ActiveChart.ChartType = xlXYScatter
    ActiveChart.SetSourceData Source:=Sheets("Sheet1").Range("A1:F4"), PlotBy _
        :=xlRows
    ActiveChart.SeriesCollection(2).Delete
    ActiveChart.SeriesCollection(1).XValues = "=Sheet1!R2C5:R4C5"
    ActiveChart.SeriesCollection(1).Values = "=Sheet1!R2C2:R4C2"
    ActiveChart.SeriesCollection(1).Name = "=""Test"""

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Thanks in advance.