access PowerPoint chart c#

Question

Hi,

I have a problem in a c# projet. In fact, i did a PowerPoint-add-in and i want to generate Charts on Slides.

I create a slide with :

using PowerPoint = Microsoft.Office.Interop.PowerPoint;
using Microsoft.Office.Interop.Graph;

Microsoft.Office.Interop.Graph.Chart objChart;
objChart = (Microsoft.Office.Interop.Graph.Chart)objShape.OLEFormat.Object;`

The chart is create on the slide but i can't access to the data to update or insert.

I have try with the Datasheet like below :

//DataSheet test = objChart.Application.DataSheet;
//test.Cells.Clear()

This delete the data of the chart but i dont find a solution to insert values in the chart data after.

Best Regards,

Chomel Jeremy