How to sum the column in a data table?

Question

I have a data table .I want to sum the column and append it to an array.

Name	Count	Time
A	5	1/1/2017 10:00:00AM
B	4	1/1/2017 10:00:00AM
C	5	1/1/2017 10:00:00AM
D	2	1/1/2017 10:00:00AM
E	3	1/1/2017 11:00:00AM
F	3	1/1/2017 11:00:00AM
G	4	1/1/2017 11:00:00AM
H	5	1/1/2017 11:00:00AM
I	2	1/1/2017 12:00:00AM
J	3	1/1/2017 12:00:00AM
K	5	1/1/2017 12:00:00AM
L	6	1/1/2017 12:00:00AM

 

I Want to add the count column if the Time in column is same. (Ex:)The time  (1/1/2017 10:00:00AM) Same for A,B,C,D. So i want to add the count column of A,B,C,D .How to do this .please help me to solve this issue.