Comments by Manu Smriti (Top 1 by date)

look at this you will get an idea, here in datatable we have column 'Total'.
I'm iterating thru' datatable , adding 2 in first column of datatable & storing it into Total Column
int sum;
int count=0;
foreach (var item in dtCombo.AsEnumerable())
{
sum = Convert.ToInt32(item[0]) + 2;
dtCombo.Rows[count++]["Total"] = sum;
}