#c calculate row in datatable

Question

here's what i have in my datatable so far :

then after i process it using below code, i got this output :

    private void graphBtn_Click_1(object sender, EventArgs e)

        DataRow totalsRow = my_datatable.NewRow();
        foreach (DataColumn col in my_datatable.Columns)
        {
            int colTotal = 0;
            foreach (DataRow row in col.Table.Rows)
            {
                colTotal += Int32.Parse(row[col].ToString());
            }
            totalsRow[col.ColumnName] = colTotal;
        }
        my_datatable.Rows.Add(totalsRow);

but my expected output is to have something like this :

where it calculate and display the number of resource separately, then sum up all instead of it directly add up all the number of resources.