@naeem.gittham,
I have observed your requirement image for hiding category axis values in a line chart. I like to mention that there is no option available even in PowerPoint to hide the category axis values. However, you can achieve this indirectly in a way that you add a category axis but give no name to that and it may give you illusion of what you are trying to achieve but this certainly not recommended. In that case, I suggest you to please try using following sample code.
public static void TestLineChart()
{
Presentation pres = new Presentation();
ISlide slide = pres.Slides[0];
// Creating the default chart
IChart chart = slide.Shapes.AddChart(ChartType.Line, 0, 0, 400, 400);
// Getting the default chart data worksheet index
int defaultWorksheetIndex = 0;
// Getting the chart data worksheet
IChartDataWorkbook fact = chart.ChartData.ChartDataWorkbook;
// Delete demo Categories
chart.ChartData.Categories.Clear();
// Adding new categories
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 1, 0, "1"));
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 2, 0, "2"));
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 3, 0, "3"));
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 4, 0, String.Empty));
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 5, 0, String.Empty));
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 6, 0, String.Empty));
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 7, 0, String.Empty));
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 8, 0, String.Empty));
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 9, 0, String.Empty));
chart.ChartData.Categories.Add(fact.GetCell(defaultWorksheetIndex, 10, 0, "10"));
// Delete demo series
chart.ChartData.Series.Clear();
// Add new series
chart.ChartData.Series.Add(fact.GetCell(defaultWorksheetIndex, 1, 1, "Yield"), chart.Type);
// Take first chart series
IChartSeries series = chart.ChartData.Series[0];
// Add First series point
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 1, 1, 1));
// Add 2nw series point
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 2, 1, 5));
// Add third series point
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 3, 1, 4));
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 4, 1, 4));
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 5, 1, 4));
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 6, 1, 4));
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 7, 1, 4));
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 8, 1, 4));
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 9, 1, 4));
series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 10, 1, 7));
pres.Save("C:\\Aspose Data\\AsposeChart_out.pptx", Aspose.Slides.Export.SaveFormat.Pptx);
}