See the screen shoot and help me to sum

Question

Here is my datagridview. I need the sum of AmountBDT where SuspenceAccount is Placid Express.

Sl	SuspenceAccount	AmountBDT
1	Placid Express	30
2	Prabhu Group	40
3	Placid Express	20
4	Ria Financial	70
5	Placid Express	50