calculate working hour display data with (-ve)

give me values of dr(4),dr(3),dr(5),dr(6),dr(7),dr(8) so i give u solution

dr(4),dr(3),dr(5),dr(6),dr(7),dr(8) data come from databse like 04:10:10 PM, 03:30:10 ,  01:10:10 PM, 02:10:10 PM, 11:00:00 AM, 10:00:00 AM

check one by one substration is any substration giving you -ve value

actully in when value save in database then first enter am values and after that pm values  when these values ie pm-am then it gives answer in -ve

try like this

 TimeSpan dt = DateTime.Parse("3/29/2012 05:14:35 PM").Subtract(DateTime.Parse("3/29/2012 09:14:35 AM"));
            int hh = dt.Hours;