To calculate difference between two DateTime Picker control( i.e User Entry)

Thaks a lot.... But i am also doing the same what you have asked for....
My Code is:

  

TimeSpan ts = new TimeSpan();

double s1;

double s2;

ts = dtp2.Value - dtp1.Value;

s1 = Convert.ToDouble(ts.TotalHours);

s2 = Convert.ToDouble(ts.TotalMinutes);

txt1.Text = String.Format("{0}:{1}", s1, s2);


But, i am getting the hours in correct format but minutes not in the correct format i.e some junk no.s..

 How to rectify it....

All the info you need is within TimeSpan, there's several methods within TimeSpan that will do what you require, you might need to run a few conditions with it but it will do what you need. I've not used TimeSpan before, but at a quick glance it looks like you need TimeSpan.Hours and TimeSpan.Minutes.

If you can't do simple Math functions and update a textbox I'd suggest you read up on the basics of C# programming.

Thanks am lot for your response...U had asked to to do as such:
TimeSpan ts = dateTimePicker1.Value - dateTimePicker2.Value;

 But the difference  , i am getting as  for ts is " Day(s): Hours:Min:Sec" ,  in textbox.
 What i want is to get the difference in terms of " Hours: Mins" only in textbox in the format i have written , whatsoever the user enters the date and time for each picker control..

 How to do the same...

Then i want to add all the difference of DateTime Pickers ( in terms of Hour: Min only ) in another Textbox . how to do the same . 

You could try using System.TimeSpan, something along the lines of

TimeSpan ts = dateTimePicker1.Value - dateTimePicker2.Value;