employee hours calculation in c#.

Question

hello sir i want to calculate total working hours of employee in c#.

 like IN=10:00

        OUT=12:00

        IN:1:00

        OUT:5:00 

   duration=2+5=7;

 below code calculate only last in and out duration i want all in and out dueation time.

 

if (dt1.Rows.Count > 0)

{

for (int j = 0; j < dt1.Rows.Count; j++)

{

DateDay = Convert.ToDateTime(dt1.Rows[j]["emp_ToDate"]);

string st = dt1.Rows[j]["emp_InOut"].ToString();

string time1 = (dt1.Rows[j]["emp_Time"]).ToString();

if (st == ("IN"))

{

Input = Convert.ToString((time1));

}else

if (st == "OUT")

{

Output = Convert.ToString((time1));

}

try

{

duration2 = duration + (DateTime.Parse(Input).Subtract(DateTime.Parse(Output)).Duration());

}

catch { }

}