how to calculate working hours of employee in asp.net

Question

i have below table in and i wan to calculate employee daily working hours

i want to calculate employees in time and out time check box shows login status that when employee login and how many time he logedout
so please help me i m confuse how to calculate time. i m able to sum the in time and out time buts not giving me correct result

AttendaneId	EmpID	Cdate	Time	LogStatus
11	D1	7/29/2017	09:07:00
12	D1	7/29/2017	13:00:00
13	D1	7/29/2017	14:05:00
14	D1	7/29/2017	17:41:00

 

thank you